fix(flight): show boundary warning only while flying

README.md

@@ -22,30 +22,39 @@ The plugin JAR is written to `build/libs/`.
 ## Player commands
 
 ```text
-/setbase
-/base
-/base upgrade
-/basenavigation
-/baseflight
-/basevisitors
-/gotobase <player>
-/baseprogress
-/baseprogress bossbar
+/setbase (alias: /sethome)
+/base (alias: /home)
+/gotobase <player> (alias: /visit <player>)
+/basesettings (alias: /homesettings)
+/basesettings status
+/basesettings upgrade
+/basesettings visitors <allowed|blocked>
+/basesettings navigation <enable|disable>
+/basesettings flight <enable|disable>
+/basesettings border <enable|disable>
+/basesettings spawnable <enable|disable>
+/basesettings bossbar <enable|disable>
 ```
 
+Navigation particles appear only in the base's world and when the player is more than 25 blocks beyond the current base border.
+
+After 250 Survival-mode block placements anywhere by default, the spawnable overlay can mark nearby dark hostile-mob spawning surfaces inside the player's base with owner-only red particles. The threshold is configurable.
+
 `/base` has a stationary warm-up. Looking around is allowed, while movement between blocks, damage, teleportation, world changes, death, logout, and conflicting teleport commands cancel it without consuming the cooldown.
 
 ## Administration
 
-The `spigotbase.admin` permission is granted to server operators by default.
+The `spigotbase.admin` permission is granted to server operators by default. `/homeadmin` aliases `/baseadmin`.
 
 ```text
-/baseadmin progress <player>
+/baseadmin status <player>
 /baseadmin setlevel <player> <base|size|flight|warmup|cooldown> <level>
-/baseadmin setprogress <player> <grass_dirt|stone|deepslate|obsidian|placements|base_breaks> <amount>
+/baseadmin setprogress <player> <grass_dirt|stone|deepslate|obsidian|placements|total_placements|base_breaks> <amount>
+/baseadmin setsetting <player> spawnable <enable|disable>
 /baseadmin config <numeric-key> <value>
+# e.g. /baseadmin config spawnable-overlay-unlock-placements 250
 /baseadmin clearcooldown <player> [personal|visitor|all]
-/baseadmin reset <player> <base|size|flight|warmup|cooldown>
+/baseadmin reset <player> <size|flight|warmup|cooldown>
 /baseadmin reset <player> all confirm
 ```
 

design/log.md

@@ -40,3 +40,54 @@ description: Chronological record of material decisions affecting the Spigot Bas
 - Made progression materials, visitor currency, boss-bar duration, particle count, and title timing configurable.
 - Preserved unknown forward-compatible YAML fields for retained player records while continuing to reject invalid progression state.
 - Completed and verified all approved user stories with the automated Gradle check lifecycle.
+
+## 2026-08-10 — Player command aliases
+
+- Added `/sethome` for `/setbase`, `/home` for `/base`, and `/visit` for `/gotobase`.
+- Visitor autocomplete remains available for eligible offline bases through the `/visit` alias.
+- Verified the aliases and plugin build with `./gradlew clean check jar`.
+
+## 2026-08-10 — Toggle command autocomplete
+
+- Added explicit, idempotent `on` and `off` modes and autocomplete to base flight and visitor access while retaining no-argument toggling.
+- Added `/homenavigation`, `/homeflight`, and `/homevisitors` aliases with the same autocomplete as their canonical commands.
+- Generalized toggle preference resolution for navigation, flight, and visitor access.
+- Verified the implementation with `./gradlew clean check jar`.
+
+## 2026-08-10 — Unified base settings command
+
+- Replaced the separate progress, navigation, flight, and visitor commands with `/basesettings` and its `/homesettings` alias.
+- Added nested autocomplete for status, Base IV upgrades, visitor access, navigation, flight, and progress boss-bar settings.
+- Moved the Base IV purchase from `/base upgrade` to `/basesettings upgrade`, leaving `/base` and `/home` dedicated to personal teleportation.
+- Preserved the full progression report as the default `/basesettings` response and as `/basesettings status`.
+- Verified the breaking command restructure with `./gradlew clean check jar`.
+
+## 2026-08-10 — Administrative command autocomplete and reset safety
+
+- Added `/homeadmin` as an alias for `/baseadmin` and replaced the administrative `progress` subcommand with `status`.
+- Added permission-aware, context-sensitive autocomplete for subcommands, online and known offline players, paths, levels, counters, cooldown types, reset confirmation, and numeric configuration keys.
+- Removed the unsafe unconfirmed base reset path; complete resets now require `reset <player> all confirm`.
+- Tightened argument validation and replaced implementation-specific enum errors with player-facing usage guidance.
+- Verified the administrative revision with `./gradlew clean check jar`.
+
+## 2026-08-10 — Base border visualization
+
+- Added persisted, owner-only base border particles controlled by `/basesettings border enable|disable` with contextual autocomplete.
+- Rendered a bounded nearby arc at the player's current height using the current base radius while respecting world and vertical bounds.
+- Added border preference reporting to player and administrative status output and safe defaults for existing state files.
+- Verified the feature with `./gradlew clean check jar`.
+
+## 2026-08-10 — Spawnable block overlay
+
+- Added persistent progression for Survival-mode block placements anywhere, with existing in-base placement counts used as a safe migration minimum.
+- Added `/basesettings spawnable enable|disable` after a configurable 250-placement unlock and reported its progress and preference in player and admin status output.
+- Added admin controls for total placement progress, the unlock threshold, and each unlocked player's overlay preference.
+- Added owner-only red particles for nearby dark spawning surfaces inside base bounds, using bounded incremental scanning and rendering budgets.
+- Verified the feature with `./gradlew clean check jar`.
+
+## 2026-08-10 — Navigation visibility buffer
+
+- Limited enabled base navigation particles to the base's world and positions more than 25 horizontal blocks beyond the current base border.
+- Used the live size-tier radius so expansion and relocation immediately update the visibility threshold.
+- Added exact-boundary and controller integration coverage.
+- Verified the change with `./gradlew clean check jar`.

design/user-stories/index.md

@@ -18,3 +18,5 @@ description: Catalog of user stories for the Spigot Base plugin.
 10. [US-010: Administer player progression](us-010-administer-player-progression.md)
 11. [US-011: Configure and persist progression](us-011-configure-and-persist-progression.md)
 12. [US-012: Build and release the plugin](us-012-build-and-release-plugin.md)
+13. [US-013: Visualize the base border](us-013-visualize-base-border.md)
+14. [US-014: Highlight spawnable blocks](us-014-highlight-spawnable-blocks.md)

design/user-stories/us-001-unlock-and-establish-base.md

@@ -17,6 +17,7 @@ As a **player**, I want to earn and set a personal base so that later quality-of
 - [x] Player-placed blocks may contribute when broken; natural-generation detection is not required.
 - [x] Base I unlocks when the player reaches the configured threshold, which defaults to 250 qualifying blocks.
 - [x] `/setbase` is unavailable before Base I and explains the unmet requirement.
+- [x] `/sethome` is an alias for `/setbase` with identical behavior.
 - [x] After Base I unlocks, `/setbase` records the player's current world and block location as the center of a cylindrical base.
 - [x] The initial cylinder has a configurable 10-block horizontal radius and extends a configurable 25 blocks above and 25 blocks below the set Y coordinate.
 - [x] The first successful `/setbase` is immediately available.

design/user-stories/us-002-unlock-base-navigation.md

@@ -14,12 +14,13 @@ As a **player with Base I**, I want visual guidance toward my base so that I can
 - [x] Base II requires Base I and an established base.
 - [x] Base II unlocks at a configurable cumulative grass-or-dirt threshold that defaults to 500 blocks, 250 more than Base I.
 - [x] Base II provides particle-based navigation and does not grant or require a physical compass item.
-- [x] While enabled and in the base's world, particles are drawn along the ground to indicate the direction toward the base.
+- [x] While enabled and in the base's world, particles are drawn along the ground only when the player is horizontally more than 25 blocks beyond the current base border.
+- [x] No navigation particles appear inside the base, exactly 25 blocks beyond its border, or anywhere within that buffer.
+- [x] Expansion and relocation update the navigation visibility threshold immediately.
 - [x] Particle generation is bounded to avoid excessive server or client load.
 - [x] A player in another world receives a clear message instead of a misleading particle direction.
-- [x] `/basenavigation` toggles guidance on and off after Base II is unlocked.
-- [x] `/basenavigation on` enables guidance idempotently and `/basenavigation off` disables it idempotently.
-- [x] Invalid navigation arguments show command usage, and `on` and `off` are offered through autocomplete.
+- [x] `/basesettings navigation enable` enables guidance idempotently after Base II is unlocked, and `/basesettings navigation disable` disables it idempotently.
+- [x] Invalid navigation arguments show command usage, and `enable` and `disable` are offered through autocomplete.
 - [x] Grass-or-dirt progress after Base II preserves the player's selected navigation preference.
 - [x] The navigation preference persists across reconnects and restarts.
 

design/user-stories/us-004-unlock-and-control-base-flight.md

@@ -21,10 +21,11 @@ As a **player with Base I**, I want to unlock controlled flight around my base s
 - [x] Flight II expands the vertical range to 100 blocks below and above base Y by default.
 - [x] Flight III expands the vertical range to the world's minimum and maximum build heights.
 - [x] A configurable five-block horizontal warning buffer extends beyond the current base radius.
-- [x] Plugin-granted flight remains active in the warning buffer and displays prominent on-screen notice that the player is leaving the base.
+- [x] Plugin-granted flight remains active in the warning buffer, and a prominent on-screen notice that the player is leaving the base appears only while the player is actively flying.
 - [x] Passing beyond the warning buffer removes only flight granted by this plugin.
 - [x] Flight is not granted outside the unlocked vertical range.
-- [x] `/baseflight` toggles the player's unlocked base flight on and off.
+- [x] `/basesettings flight enable` enables unlocked flight idempotently, and `/basesettings flight disable` disables it idempotently.
+- [x] Invalid flight arguments show command usage, and `enable` and `disable` are offered through autocomplete.
 - [x] The flight toggle persists across reconnects and restarts.
 - [x] The plugin handles teleportation, world changes, game-mode changes, death, logout, and plugin shutdown without leaving unintended flight enabled.
 

design/user-stories/us-005-unlock-base-teleportation.md

@@ -15,6 +15,7 @@ As a **player with Base II**, I want to earn `/base` so that I can return safely
 - [x] Only placements made in Survival mode and within the base's current horizontal and vertical bounds count.
 - [x] Player-placed blocks and replacement of previously broken blocks may contribute repeatedly.
 - [x] Base III unlocks `/base` with a configurable 30-second warm-up and three-hour cooldown by default.
+- [x] `/home` aliases the teleport-only `/base` command.
 - [x] Looking around without changing block coordinates does not cancel the warm-up.
 - [x] Changing block X, Y, or Z, taking damage, teleporting, changing worlds, dying, disconnecting, or starting a conflicting teleport cancels the warm-up.
 - [x] Cancellation clearly informs the player and does not consume the cooldown.

design/user-stories/us-008-unlock-visitor-access.md

@@ -12,12 +12,14 @@ As a **player with Base III**, I want to open my base to visitors so that other
 ## Acceptance criteria
 
 - [x] Base IV requires Base III and an established base.
-- [x] `/base upgrade` offers the Base IV purchase for a configurable price that defaults to 128 diamonds.
+- [x] `/basesettings upgrade` offers the Base IV purchase for a configurable price that defaults to 128 diamonds, replacing `/base upgrade` and `/home upgrade`.
 - [x] A successful purchase removes the complete price atomically from the player's direct inventory.
 - [x] Insufficient funds, an invalid state, or a failed persistence operation does not consume any diamonds or grant Base IV.
-- [x] `/basevisitors` lets a Base IV owner toggle visitor access on and off.
+- [x] `/basesettings visitors allowed` permits visitor access idempotently for a Base IV owner, and `/basesettings visitors blocked` blocks it idempotently.
+- [x] Invalid visitor arguments show command usage, and `allowed` and `blocked` are offered through autocomplete.
 - [x] The visitor-access preference persists across reconnects and restarts.
 - [x] `/gotobase <owner>` autocompletes bases that the requesting player is currently eligible to visit.
+- [x] `/visit <owner>` aliases `/gotobase <owner>` with identical autocomplete, including eligible bases whose owners are offline.
 - [x] Enabled bases remain visitable while their owners are offline.
 - [x] A visitor teleport uses the destination owner's current warm-up tier.
 - [x] Looking around is permitted, while movement between block coordinates, damage, teleportation, world change, death, logout, or a conflicting teleport cancels the visitor warm-up.

design/user-stories/us-009-view-progression-and-notifications.md

@@ -11,17 +11,20 @@ As a **player**, I want to inspect my progression and receive timely milestone f
 
 ## Acceptance criteria
 
-- [x] `/baseprogress` shows the player's Base, Base Size, Base Flight, Teleport Warm-up, and Teleport Cooldown paths.
+- [x] `/basesettings` and `/basesettings status` show the player's Base, Base Size, Base Flight, Teleport Warm-up, and Teleport Cooldown paths plus current visitor, navigation, flight, and boss-bar settings.
 - [x] Each path identifies earned levels, unmet prerequisites, current progress, the next threshold, and the next reward.
 - [x] Locked secondary paths clearly identify Base I or another sequential level as their prerequisite.
 - [x] Relevant qualifying activity briefly displays a configurable progress boss bar for the active milestone.
 - [x] Boss-bar text and fill accurately represent the current count and threshold and never exceed 100 percent.
 - [x] The automatic boss bar disappears after a configurable number of seconds.
-- [x] `/baseprogress bossbar` toggles automatic progress boss bars on and off.
-- [x] Disabling automatic boss bars does not prevent `/baseprogress` from displaying progress.
+- [x] `/basesettings bossbar enable` enables automatic progress boss bars idempotently, and `/basesettings bossbar disable` disables them idempotently.
+- [x] Invalid boss-bar arguments show command usage, and `enable` and `disable` are offered through autocomplete.
+- [x] Disabling automatic boss bars does not prevent `/basesettings` from displaying progress.
 - [x] The boss-bar preference persists across reconnects and restarts.
 - [x] Each newly unlocked level displays prominent full-screen title and subtitle text describing the reward.
 - [x] Unlock notifications occur once per earned level and do not repeat after reconnecting or restarting.
+- [x] `/homesettings` aliases `/basesettings` with identical behavior and autocomplete.
+- [x] Superseded `/baseprogress`, `/basenavigation`, `/baseflight`, and `/basevisitors` commands and their aliases are no longer registered.
 
 ## Related
 

design/user-stories/us-010-administer-player-progression.md

@@ -14,16 +14,20 @@ As a **server administrator**, I want command-based progression controls so that
 - [x] Administrative commands require `spigotbase.admin`, which server operators receive by default.
 - [x] Administrative player arguments safely resolve online players and previously known offline players.
 - [x] Player state remains keyed by UUID while retaining the latest known name for lookup and display.
-- [x] `/baseadmin progress <player>` displays the player's base, counters, earned path levels, active cooldowns, toggles, and visitor settings.
+- [x] `/baseadmin status <player>` displays the player's base, counters, earned path levels, active cooldowns, toggles, and visitor settings.
 - [x] `/baseadmin setlevel <player> <path> <level>` sets an earned path level while enforcing or explicitly granting required preceding levels.
 - [x] `/baseadmin setprogress <player> <path> <amount>` updates the selected counter and consistently evaluates reached tiers.
-- [x] `/baseadmin reset <player> <path>` resets a selected path without silently leaving benefits that require it.
+- [x] `/baseadmin reset <player> <size|flight|warmup|cooldown>` resets a selected path without silently leaving benefits that require it.
+- [x] `/baseadmin reset <player> base` is rejected and directs the administrator to the confirmed complete-reset command.
 - [x] `/baseadmin reset <player> all` removes the player's base, progression, active cooldowns, and plugin preferences after confirmation.
 - [x] Administrators can clear personal and visitor cooldowns independently.
 - [x] Administrative commands can update configured block requirements, warm-ups, and cooldowns for each level using validated values.
 - [x] Runtime configuration changes are persisted for subsequent restarts.
 - [x] Lowered progression requirements are evaluated for a player on their next relevant action rather than immediately updating every stored player.
 - [x] Every successful mutation reports exactly what changed, and invalid requests make no partial changes.
+- [x] `/homeadmin` aliases `/baseadmin` with identical permission requirements and autocomplete.
+- [x] Permission-aware autocomplete offers subcommands, online and known offline players, progression paths, valid levels, progress counters, cooldown types, reset paths and confirmation, and numeric configuration keys.
+- [x] Invalid and extra arguments show friendly usage without exposing implementation-specific enum errors or modifying state.
 
 ## Related
 

design/user-stories/us-013-visualize-base-border.md

@@ -0,0 +1,31 @@
+---
+type: User Story
+title: "US-013: Visualize the base border"
+description: Let players display a bounded, owner-only particle arc along the current edge of their established base.
+status: done
+---
+
+# US-013: Visualize the base border
+
+As a **player with Base I**, I want to display a particle effect at my base border so that I can understand where base benefits begin and end while building.
+
+## Acceptance criteria
+
+- [x] Border visualization requires Base I and an established base.
+- [x] `/basesettings border enable` enables visualization idempotently, and `/basesettings border disable` disables it idempotently.
+- [x] `border`, `enable`, and `disable` are offered through contextual autocomplete.
+- [x] Border visualization is disabled by default and the preference persists across reconnects and restarts.
+- [x] Older state files without the preference load it as disabled.
+- [x] `/basesettings status` and `/baseadmin status` display the border preference.
+- [x] Particles are visible only to the base owner.
+- [x] Particles trace the current circular horizontal boundary at the player's current Y-level and follow base expansion or relocation immediately.
+- [x] Particles render only while the player is in the base world, within the base's vertical range, and reasonably close to the boundary.
+- [x] Particle generation is bounded to avoid excessive server and client load.
+- [x] A complete administrative reset disables border visualization.
+
+## Related
+
+- [US-001: Unlock and establish Base I](us-001-unlock-and-establish-base.md)
+- [US-003: Expand the base](us-003-expand-the-base.md)
+- [US-009: View progression and unlock notifications](us-009-view-progression-and-notifications.md)
+- [US-010: Administer player progression](us-010-administer-player-progression.md)

design/user-stories/us-014-highlight-spawnable-blocks.md

@@ -0,0 +1,34 @@
+---
+type: User Story
+title: "US-014: Highlight spawnable blocks"
+description: Unlock an owner-only red particle overlay for nearby hostile-mob spawnable blocks after 250 placements anywhere.
+status: done
+---
+
+# US-014: Highlight spawnable blocks
+
+As a **player with an established base**, I want to highlight nearby blocks where hostile mobs can spawn so that I can find lighting gaps in my base.
+
+## Acceptance criteria
+
+- [x] Every block placed in Survival mode anywhere contributes to a persistent total-placement counter.
+- [x] The overlay unlocks permanently at a configurable 250 total placements by default.
+- [x] Existing players begin with at least their persisted in-base placement count because those placements are known to qualify.
+- [x] `/basesettings spawnable enable` enables the unlocked overlay idempotently, and `/basesettings spawnable disable` disables it idempotently.
+- [x] `spawnable`, `enable`, and `disable` are offered through contextual autocomplete.
+- [x] Enabling requires both the placement unlock and an established base; the persisted preference defaults to disabled.
+- [x] `/basesettings status` and `/baseadmin status` display placement progress, unlock state, and preference.
+- [x] Administrators can change a player's total-placement counter through `/baseadmin setprogress`.
+- [x] Administrators can persistently change the required placement threshold through `/baseadmin config spawnable-overlay-unlock-placements`.
+- [x] Administrators can enable or disable an unlocked player's overlay through `/baseadmin setsetting <player> spawnable <enable|disable>`.
+- [x] Owner-only red particles mark nearby candidate hostile-mob spawning surfaces inside the current base bounds.
+- [x] Candidate surfaces have block light zero, a solid spawning surface, and two passable blocks above them.
+- [x] Scanning is bounded to 16 horizontal blocks, eight vertical blocks, and a fixed per-update work and particle budget.
+- [x] A complete administrative reset clears total-placement progress and disables the overlay.
+
+## Related
+
+- [US-001: Unlock and establish Base I](us-001-unlock-and-establish-base.md)
+- [US-009: View progression and notifications](us-009-view-progression-and-notifications.md)
+- [US-010: Administer player progression](us-010-administer-player-progression.md)
+- [US-011: Configure and persist progression](us-011-configure-and-persist-progression.md)

src/main/java/games/dmg/spigotbase/AdminProgressionService.java

@@ -92,6 +92,7 @@ public final class AdminProgressionService {
         long deepslate = player.deepslateBroken();
         long obsidian = player.obsidianBroken();
         long placements = player.blocksPlacedInBase();
+        long totalPlacements = player.totalBlocksPlaced();
         long baseBreaks = player.blocksBrokenInBase();
         switch (counter) {
             case GRASS_DIRT -> grassDirt = amount;
@@ -99,6 +100,7 @@ public final class AdminProgressionService {
             case DEEPSLATE -> deepslate = amount;
             case OBSIDIAN -> obsidian = amount;
             case PLACEMENTS -> placements = amount;
+            case TOTAL_PLACEMENTS -> totalPlacements = amount;
             case BASE_BREAKS -> baseBreaks = amount;
         }
         PluginSettings configured = settings.current();
@@ -147,7 +149,11 @@ public final class AdminProgressionService {
         }
         PlayerState updated = player.withProgressCounters(
             grassDirt, stone, deepslate, obsidian, placements, baseBreaks
-        );
+        ).withTotalBlocksPlaced(totalPlacements);
+        if (totalPlacements < configured.spawnableOverlayUnlockPlacements()
+                && updated.spawnableOverlayEnabled()) {
+            updated = updated.withSpawnableOverlayEnabled(false);
+        }
         return updated.withAdministrativeLevels(
             base,
             size,

src/main/java/games/dmg/spigotbase/BaseAdminCommand.java

@@ -1,17 +1,38 @@
 package games.dmg.spigotbase;
 
 import java.util.Arrays;
+import java.util.List;
 import java.util.Locale;
 import java.util.Optional;
+import java.util.TreeSet;
 import org.bukkit.Bukkit;
 import org.bukkit.ChatColor;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
+import org.bukkit.command.TabCompleter;
 import org.bukkit.entity.Player;
 import org.bukkit.plugin.java.JavaPlugin;
 
-final class BaseAdminCommand implements CommandExecutor {
+final class BaseAdminCommand implements CommandExecutor, TabCompleter {
+    private static final List<String> SUBCOMMANDS = List.of(
+        "status", "setlevel", "setprogress", "setsetting", "clearcooldown", "reset", "config"
+    );
+    private static final List<String> PATHS = List.of(
+        "base", "size", "flight", "warmup", "cooldown"
+    );
+    private static final List<String> COUNTERS = List.of(
+        "grass_dirt", "stone", "deepslate", "obsidian", "placements", "total_placements",
+        "base_breaks"
+    );
+    private static final List<String> SETTINGS = List.of("spawnable");
+    private static final List<String> ENABLE_MODES = List.of("enable", "disable");
+    private static final List<String> COOLDOWN_TYPES = List.of("personal", "visitor", "all");
+    private static final List<String> RESET_PATHS = List.of(
+        "size", "flight", "warmup", "cooldown", "all"
+    );
+    private static final List<String> LEVELS_THREE = List.of("0", "1", "2", "3");
+    private static final List<String> LEVELS_FOUR = List.of("0", "1", "2", "3", "4");
     private final JavaPlugin plugin;
     private final BaseStateManager stateManager;
     private final AdminProgressionService progressionService;
@@ -48,9 +69,10 @@ final class BaseAdminCommand implements CommandExecutor {
             return true;
         }
         return switch (arguments[0].toLowerCase(Locale.ROOT)) {
-            case "progress" -> showProgress(sender, target.orElseThrow());
+            case "status" -> showProgress(sender, target.orElseThrow(), arguments);
             case "setlevel" -> setLevel(sender, target.orElseThrow(), arguments);
             case "setprogress" -> setProgress(sender, target.orElseThrow(), arguments);
+            case "setsetting" -> setSetting(sender, target.orElseThrow(), arguments);
             case "clearcooldown" -> clearCooldown(sender, target.orElseThrow(), arguments);
             case "reset" -> reset(sender, target.orElseThrow(), arguments);
             default -> {
@@ -60,7 +82,15 @@ final class BaseAdminCommand implements CommandExecutor {
         };
     }
 
-    private boolean showProgress(CommandSender sender, PlayerState player) {
+    private boolean showProgress(
+        CommandSender sender,
+        PlayerState player,
+        String[] arguments
+    ) {
+        if (arguments.length != 2) {
+            sender.sendMessage(ChatColor.RED + "Usage: /baseadmin status <player>");
+            return true;
+        }
         sender.sendMessage(ChatColor.GOLD + "=== " + player.latestName() + " Base Progress ===");
         sender.sendMessage(ChatColor.YELLOW + "Levels: base=" + player.baseLevel()
             + " size=" + player.sizeLevel() + " flight=" + player.flightLevel()
@@ -68,11 +98,17 @@ final class BaseAdminCommand implements CommandExecutor {
         sender.sendMessage(ChatColor.GRAY + "Grass/dirt=" + player.grassAndDirtBroken()
             + " stone=" + player.stoneBroken() + " deepslate=" + player.deepslateBroken()
             + " obsidian=" + player.obsidianBroken());
+        int spawnableThreshold = settingsProvider.current()
+            .spawnableOverlayUnlockPlacements();
         sender.sendMessage(ChatColor.GRAY + "In-base placements=" + player.blocksPlacedInBase()
+            + " total placements=" + player.totalBlocksPlaced()
             + " breaks=" + player.blocksBrokenInBase());
+        sender.sendMessage(ChatColor.GRAY + "Spawnable overlay="
+            + (player.totalBlocksPlaced() >= spawnableThreshold ? "unlocked" : "locked")
+            + " (" + player.totalBlocksPlaced() + "/" + spawnableThreshold + ")");
         sender.sendMessage(ChatColor.GRAY + "Toggles: navigation=" + player.navigationEnabled()
-            + " flight=" + player.flightEnabled() + " bossbar=" + player.bossBarEnabled()
-            + " visitors=" + player.visitorsEnabled());
+            + " flight=" + player.flightEnabled() + " border=" + player.borderEnabled()
+            + " spawnable=" + player.spawnableOverlayEnabled() + " bossbar=" + player.bossBarEnabled() + " visitors=" + player.visitorsEnabled());
         sender.sendMessage(ChatColor.GRAY + "Base: " + player.base()
             .map(base -> base.worldName() + " " + base.x() + "," + base.y() + "," + base.z())
             .orElse("not set"));
@@ -89,8 +125,16 @@ final class BaseAdminCommand implements CommandExecutor {
             sender.sendMessage(ChatColor.RED + "Usage: /baseadmin setlevel <player> <path> <level>");
             return true;
         }
+        final ProgressionPath path;
+        try {
+            path = ProgressionPath.valueOf(arguments[2].toUpperCase(Locale.ROOT));
+        } catch (IllegalArgumentException exception) {
+            sender.sendMessage(ChatColor.RED
+                + "Usage: /baseadmin setlevel <player> "
+                + "<base|size|flight|warmup|cooldown> <level>");
+            return true;
+        }
         try {
-            ProgressionPath path = ProgressionPath.valueOf(arguments[2].toUpperCase(Locale.ROOT));
             int level = Integer.parseInt(arguments[3]);
             PlayerState updated = stateManager.update(
                 target.playerId(),
@@ -100,6 +144,8 @@ final class BaseAdminCommand implements CommandExecutor {
             stateManager.saveIfDirty();
             sender.sendMessage(ChatColor.GREEN + "Set " + updated.latestName() + "'s "
                 + path.name().toLowerCase(Locale.ROOT) + " level to " + level + ".");
+        } catch (NumberFormatException exception) {
+            sender.sendMessage(ChatColor.RED + "The level must be an integer.");
         } catch (IllegalArgumentException exception) {
             sender.sendMessage(ChatColor.RED + exception.getMessage());
         }
@@ -116,10 +162,19 @@ final class BaseAdminCommand implements CommandExecutor {
                 + "Usage: /baseadmin setprogress <player> <counter> <amount>");
             return true;
         }
+        final ProgressCounter counter;
         try {
-            ProgressCounter counter = ProgressCounter.valueOf(
+            counter = ProgressCounter.valueOf(
                 arguments[2].toUpperCase(Locale.ROOT).replace('-', '_')
             );
+        } catch (IllegalArgumentException exception) {
+            sender.sendMessage(ChatColor.RED
+                + "Usage: /baseadmin setprogress <player> "
+                + "<grass_dirt|stone|deepslate|obsidian|placements|total_placements|base_breaks> "
+                + "<amount>");
+            return true;
+        }
+        try {
             long amount = Long.parseLong(arguments[3]);
             PlayerState updated = stateManager.update(
                 target.playerId(),
@@ -137,12 +192,50 @@ final class BaseAdminCommand implements CommandExecutor {
         return true;
     }
 
+    private boolean setSetting(
+        CommandSender sender,
+        PlayerState target,
+        String[] arguments
+    ) {
+        if (arguments.length != 4
+                || !arguments[2].equalsIgnoreCase("spawnable")
+                || !ENABLE_MODES.contains(arguments[3].toLowerCase(Locale.ROOT))) {
+            sender.sendMessage(ChatColor.RED + "Usage: /baseadmin setsetting <player> "
+                + "spawnable <enable|disable>");
+            return true;
+        }
+        boolean enabled = arguments[3].equalsIgnoreCase("enable");
+        if (enabled && target.totalBlocksPlaced()
+                < settingsProvider.current().spawnableOverlayUnlockPlacements()) {
+            sender.sendMessage(ChatColor.RED + "That player has not unlocked the spawnable overlay.");
+            return true;
+        }
+        if (enabled && (target.baseLevel() < 1 || target.base().isEmpty())) {
+            sender.sendMessage(ChatColor.RED + "That player does not have an established base.");
+            return true;
+        }
+        PlayerState updated = stateManager.update(
+            target.playerId(),
+            target.latestName(),
+            current -> current.withSpawnableOverlayEnabled(enabled)
+        );
+        stateManager.saveIfDirty();
+        sender.sendMessage(ChatColor.GREEN + "Set " + updated.latestName()
+            + "'s spawnable overlay to " + (enabled ? "enabled" : "disabled") + ".");
+        return true;
+    }
+
     private boolean clearCooldown(
         CommandSender sender,
         PlayerState target,
         String[] arguments
     ) {
-        String selection = arguments.length >= 3
+        if (arguments.length < 2 || arguments.length > 3) {
+            sender.sendMessage(ChatColor.RED
+                + "Usage: /baseadmin clearcooldown <player> [personal|visitor|all]");
+            return true;
+        }
+        String selection = arguments.length == 3
             ? arguments[2].toLowerCase(Locale.ROOT)
             : "all";
         if (!Arrays.asList("personal", "visitor", "all").contains(selection)) {
@@ -186,8 +279,26 @@ final class BaseAdminCommand implements CommandExecutor {
             sender.sendMessage(ChatColor.GREEN + "Reset all progression for " + target.latestName() + ".");
             return true;
         }
+        if (arguments.length != 3) {
+            sender.sendMessage(ChatColor.RED
+                + "Usage: /baseadmin reset <player> <size|flight|warmup|cooldown|all> [confirm]");
+            return true;
+        }
+        if (arguments[2].equalsIgnoreCase("base")) {
+            sender.sendMessage(ChatColor.RED
+                + "Resetting base removes all progression. Use: /baseadmin reset "
+                + target.latestName() + " all confirm");
+            return true;
+        }
+        final ProgressionPath path;
+        try {
+            path = ProgressionPath.valueOf(arguments[2].toUpperCase(Locale.ROOT));
+        } catch (IllegalArgumentException exception) {
+            sender.sendMessage(ChatColor.RED
+                + "Usage: /baseadmin reset <player> <size|flight|warmup|cooldown|all> [confirm]");
+            return true;
+        }
         try {
-            ProgressionPath path = ProgressionPath.valueOf(arguments[2].toUpperCase(Locale.ROOT));
             stateManager.update(
                 target.playerId(),
                 target.latestName(),
@@ -239,6 +350,80 @@ final class BaseAdminCommand implements CommandExecutor {
         return true;
     }
 
+    @Override
+    public List<String> onTabComplete(
+        CommandSender sender,
+        Command command,
+        String alias,
+        String[] arguments
+    ) {
+        if (!sender.hasPermission("spigotbase.admin")) {
+            return List.of();
+        }
+        if (arguments.length == 1) {
+            String prefix = arguments[0].toLowerCase(Locale.ROOT);
+            return SUBCOMMANDS.stream()
+                .filter(subcommand -> subcommand.startsWith(prefix))
+                .toList();
+        }
+        if (arguments.length == 2 && arguments[0].equalsIgnoreCase("config")) {
+            String prefix = arguments[1].toLowerCase(Locale.ROOT);
+            return plugin.getConfig().getValues(false).entrySet().stream()
+                .filter(entry -> entry.getValue() instanceof Number)
+                .map(java.util.Map.Entry::getKey)
+                .filter(key -> key.toLowerCase(Locale.ROOT).startsWith(prefix))
+                .sorted(String.CASE_INSENSITIVE_ORDER)
+                .toList();
+        }
+        if (arguments.length == 2) {
+            String prefix = arguments[1].toLowerCase(Locale.ROOT);
+            TreeSet<String> names = new TreeSet<>(String.CASE_INSENSITIVE_ORDER);
+            stateManager.knownPlayers().values().stream()
+                .map(PlayerState::latestName)
+                .forEach(names::add);
+            if (plugin.getServer() != null) {
+                plugin.getServer().getOnlinePlayers().stream()
+                    .map(Player::getName)
+                    .forEach(names::add);
+            }
+            return names.stream()
+                .filter(name -> name.toLowerCase(Locale.ROOT).startsWith(prefix))
+                .toList();
+        }
+        if (arguments.length == 3) {
+            List<String> options = switch (arguments[0].toLowerCase(Locale.ROOT)) {
+                case "setlevel" -> PATHS;
+                case "setprogress" -> COUNTERS;
+                case "setsetting" -> SETTINGS;
+                case "clearcooldown" -> COOLDOWN_TYPES;
+                case "reset" -> RESET_PATHS;
+                default -> List.of();
+            };
+            return complete(options, arguments[2]);
+        }
+        if (arguments.length == 4 && arguments[0].equalsIgnoreCase("setsetting")) {
+            return complete(ENABLE_MODES, arguments[3]);
+        }
+        if (arguments.length == 4 && arguments[0].equalsIgnoreCase("setlevel")) {
+            List<String> levels = switch (arguments[2].toLowerCase(Locale.ROOT)) {
+                case "base", "cooldown" -> LEVELS_FOUR;
+                case "size", "flight", "warmup" -> LEVELS_THREE;
+                default -> List.of();
+            };
+            return complete(levels, arguments[3]);
+        }
+        if (arguments.length == 4 && arguments[0].equalsIgnoreCase("reset")
+                && arguments[2].equalsIgnoreCase("all")) {
+            return complete(List.of("confirm"), arguments[3]);
+        }
+        return List.of();
+    }
+
+    private static List<String> complete(List<String> options, String input) {
+        String prefix = input.toLowerCase(Locale.ROOT);
+        return options.stream().filter(option -> option.startsWith(prefix)).toList();
+    }
+
     private Optional<PlayerState> resolve(String name) {
         Player online = Bukkit.getPlayerExact(name);
         if (online != null) {
@@ -249,7 +434,7 @@ final class BaseAdminCommand implements CommandExecutor {
 
     private static void sendUsage(CommandSender sender) {
         sender.sendMessage(ChatColor.YELLOW + "Usage: /baseadmin "
-            + "<progress|setlevel|setprogress|clearcooldown|reset> <player> ...");
+            + "<status|setlevel|setprogress|setsetting|clearcooldown|reset> <player> ...");
         sender.sendMessage(ChatColor.YELLOW + "       /baseadmin config <key> <integer>");
     }
 }

src/main/java/games/dmg/spigotbase/BaseBorderController.java

@@ -0,0 +1,62 @@
+package games.dmg.spigotbase;
+
+import org.bukkit.Location;
+import org.bukkit.Particle;
+import org.bukkit.Server;
+import org.bukkit.entity.Player;
+
+final class BaseBorderController implements Runnable {
+    private final Server server;
+    private final BaseStateManager stateManager;
+    private final BaseBoundsService boundsService;
+
+    BaseBorderController(
+        Server server,
+        BaseStateManager stateManager,
+        BaseBoundsService boundsService
+    ) {
+        this.server = server;
+        this.stateManager = stateManager;
+        this.boundsService = boundsService;
+    }
+
+    @Override
+    public void run() {
+        for (Player player : server.getOnlinePlayers()) {
+            PlayerState state = stateManager.player(player.getUniqueId(), player.getName());
+            if (!state.borderEnabled() || state.base().isEmpty()) {
+                continue;
+            }
+            BaseLocation base = state.base().orElseThrow();
+            if (!player.getWorld().getUID().equals(base.worldId())) {
+                continue;
+            }
+            Location playerLocation = player.getLocation();
+            long minimumY = (long) base.y() - boundsService.verticalRange(state);
+            long maximumY = (long) base.y() + boundsService.verticalRange(state);
+            if (playerLocation.getY() < minimumY || playerLocation.getY() > maximumY) {
+                continue;
+            }
+            for (BaseBorderGeometry.Point point : BaseBorderGeometry.visiblePoints(
+                    base.x() + 0.5,
+                    base.z() + 0.5,
+                    boundsService.radius(state),
+                    playerLocation.getX(),
+                    playerLocation.getZ()
+            )) {
+                Location particle = new Location(
+                    player.getWorld(),
+                    point.x(),
+                    playerLocation.getY() + 0.15,
+                    point.z()
+                );
+                player.spawnParticle(
+                    Particle.END_ROD,
+                    particle,
+                    1,
+                    0.0, 0.0, 0.0, 0.0
+                );
+            }
+        }
+    }
+}

src/main/java/games/dmg/spigotbase/BaseBorderGeometry.java

@@ -0,0 +1,58 @@
+package games.dmg.spigotbase;
+
+import java.util.ArrayList;
+import java.util.List;
+
+final class BaseBorderGeometry {
+    static final int MAX_PARTICLES = 64;
+    static final double VISIBILITY_DISTANCE = 32.0;
+    private static final double PARTICLE_SPACING = 1.0;
+
+    private BaseBorderGeometry() {
+    }
+
+    static List<Point> visiblePoints(
+        double centerX,
+        double centerZ,
+        int radius,
+        double playerX,
+        double playerZ
+    ) {
+        if (radius <= 0) {
+            throw new IllegalArgumentException("border radius must be positive");
+        }
+        double playerRadius = Math.hypot(playerX - centerX, playerZ - centerZ);
+        if (Math.abs(playerRadius - radius) > VISIBILITY_DISTANCE) {
+            return List.of();
+        }
+
+        double circumference = 2.0 * Math.PI * radius;
+        int count = Math.min(MAX_PARTICLES, Math.max(1, (int) Math.ceil(
+            circumference / PARTICLE_SPACING
+        )));
+        double centerAngle = Math.atan2(playerZ - centerZ, playerX - centerX);
+        double angleStep = circumference <= MAX_PARTICLES * PARTICLE_SPACING
+            ? 2.0 * Math.PI / count
+            : PARTICLE_SPACING / radius;
+        double startAngle = circumference <= MAX_PARTICLES * PARTICLE_SPACING
+            ? 0.0
+            : centerAngle - angleStep * (count - 1) / 2.0;
+
+        List<Point> points = new ArrayList<>(count);
+        double visibilitySquared = VISIBILITY_DISTANCE * VISIBILITY_DISTANCE;
+        for (int index = 0; index < count; index++) {
+            double angle = startAngle + angleStep * index;
+            double x = centerX + radius * Math.cos(angle);
+            double z = centerZ + radius * Math.sin(angle);
+            double deltaX = x - playerX;
+            double deltaZ = z - playerZ;
+            if (deltaX * deltaX + deltaZ * deltaZ <= visibilitySquared) {
+                points.add(new Point(x, z));
+            }
+        }
+        return List.copyOf(points);
+    }
+
+    record Point(double x, double z) {
+    }
+}

src/main/java/games/dmg/spigotbase/BaseCommand.java

@@ -1,31 +1,16 @@
 package games.dmg.spigotbase;
 
-import java.io.IOException;
 import org.bukkit.ChatColor;
-import org.bukkit.Material;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
-import org.bukkit.inventory.ItemStack;
-import org.bukkit.inventory.PlayerInventory;
 
 final class BaseCommand implements CommandExecutor {
     private final BaseTeleportManager teleportManager;
-    private final BaseStateManager stateManager;
-    private final VisitorPolicy visitorPolicy;
-    private final PluginSettingsProvider settings;
 
-    BaseCommand(
-        BaseTeleportManager teleportManager,
-        BaseStateManager stateManager,
-        VisitorPolicy visitorPolicy,
-        PluginSettingsProvider settings
-    ) {
+    BaseCommand(BaseTeleportManager teleportManager) {
         this.teleportManager = teleportManager;
-        this.stateManager = stateManager;
-        this.visitorPolicy = visitorPolicy;
-        this.settings = settings;
     }
 
     @Override
@@ -38,95 +23,7 @@ final class BaseCommand implements CommandExecutor {
             teleportManager.start(player);
             return true;
         }
-        if (arguments.length == 1 && arguments[0].equalsIgnoreCase("upgrade")) {
-            purchaseVisitorAccess(player);
-            return true;
-        }
-        player.sendMessage(ChatColor.RED + "Usage: /base [upgrade]");
+        player.sendMessage(ChatColor.RED + "Usage: /base");
         return true;
     }
-
-    private void purchaseVisitorAccess(Player player) {
-        PlayerState state = stateManager.player(player.getUniqueId(), player.getName());
-        if (!visitorPolicy.canPurchase(state)) {
-            player.sendMessage(ChatColor.RED + (state.baseLevel() >= 4
-                ? "Base IV is already unlocked."
-                : "You must unlock Base III before purchasing Base IV."));
-            return;
-        }
-        int price = settings.current().visitorUnlockDiamondCost();
-        Material currency = Material.valueOf(settings.current().visitorCurrencyMaterial());
-        PlayerInventory inventory = player.getInventory();
-        if (countCurrency(inventory, currency) < price) {
-            player.sendMessage(ChatColor.RED + "Base IV costs " + price + " "
-                + currency.name().toLowerCase(java.util.Locale.ROOT) + ".");
-            return;
-        }
-        ItemStack[] snapshot = cloneContents(inventory.getStorageContents());
-        removeCurrency(inventory, currency, price);
-        try {
-            stateManager.updateAndSave(
-                player.getUniqueId(),
-                player.getName(),
-                current -> current.withBaseLevel(4).withVisitorsEnabled(true)
-            );
-        } catch (IOException | RuntimeException exception) {
-            inventory.setStorageContents(snapshot);
-            player.sendMessage(ChatColor.RED + "The upgrade could not be saved; your diamonds were restored.");
-            return;
-        }
-        player.sendTitle(
-            ChatColor.GOLD + "Base IV Unlocked",
-            ChatColor.YELLOW + "Visitors may now teleport to your base",
-            settings.current().titleFadeInTicks(),
-            settings.current().titleStayTicks(),
-            settings.current().titleFadeOutTicks()
-        );
-        player.sendMessage(ChatColor.GREEN + "Base IV unlocked for " + price + " "
-            + currency.name().toLowerCase(java.util.Locale.ROOT) + ".");
-    }
-
-    private static int countCurrency(PlayerInventory inventory, Material currency) {
-        int count = 0;
-        for (ItemStack item : inventory.getStorageContents()) {
-            if (item != null && item.getType() == currency) {
-                count += item.getAmount();
-            }
-        }
-        return count;
-    }
-
-    private static void removeCurrency(
-        PlayerInventory inventory,
-        Material currency,
-        int amount
-    ) {
-        ItemStack[] contents = inventory.getStorageContents();
-        int remaining = amount;
-        for (int index = 0; index < contents.length && remaining > 0; index++) {
-            ItemStack item = contents[index];
-            if (item == null || item.getType() != currency) {
-                continue;
-            }
-            int removed = Math.min(remaining, item.getAmount());
-            remaining -= removed;
-            int newAmount = item.getAmount() - removed;
-            if (newAmount == 0) {
-                contents[index] = null;
-            } else {
-                ItemStack reduced = item.clone();
-                reduced.setAmount(newAmount);
-                contents[index] = reduced;
-            }
-        }
-        inventory.setStorageContents(contents);
-    }
-
-    private static ItemStack[] cloneContents(ItemStack[] contents) {
-        ItemStack[] copy = new ItemStack[contents.length];
-        for (int index = 0; index < contents.length; index++) {
-            copy[index] = contents[index] == null ? null : contents[index].clone();
-        }
-        return copy;
-    }
 }

src/main/java/games/dmg/spigotbase/BaseFlightCommand.java

@@ -1,43 +0,0 @@
-package games.dmg.spigotbase;
-
-import org.bukkit.ChatColor;
-import org.bukkit.command.Command;
-import org.bukkit.command.CommandExecutor;
-import org.bukkit.command.CommandSender;
-import org.bukkit.entity.Player;
-
-final class BaseFlightCommand implements CommandExecutor {
-    private final BaseStateManager stateManager;
-    private final BaseFlightController controller;
-
-    BaseFlightCommand(BaseStateManager stateManager, BaseFlightController controller) {
-        this.stateManager = stateManager;
-        this.controller = controller;
-    }
-
-    @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] arguments) {
-        if (!(sender instanceof Player player)) {
-            sender.sendMessage("Only players can use base flight.");
-            return true;
-        }
-        PlayerState state = stateManager.player(player.getUniqueId(), player.getName());
-        if (state.flightLevel() < 1) {
-            player.sendMessage(ChatColor.RED + "Base flight is still locked.");
-            return true;
-        }
-        state = stateManager.update(
-            player.getUniqueId(),
-            player.getName(),
-            current -> current.withFlightEnabled(!current.flightEnabled())
-        );
-        if (!state.flightEnabled()) {
-            controller.removeGrantedFlight(player);
-        }
-        stateManager.saveIfDirty();
-        player.sendMessage(ChatColor.YELLOW + "Base flight is now "
-            + (state.flightEnabled() ? ChatColor.GREEN + "on" : ChatColor.RED + "off")
-            + ChatColor.YELLOW + ".");
-        return true;
-    }
-}

src/main/java/games/dmg/spigotbase/BaseFlightController.java

@@ -80,7 +80,7 @@ final class BaseFlightController implements Runnable {
         stateManager.saveIfDirty();
         player.sendTitle(
             ChatColor.GOLD + "Base Flight " + roman(updated.flightLevel()) + " Unlocked",
-            ChatColor.YELLOW + "Use /baseflight to toggle flight",
+            ChatColor.YELLOW + "Use /basesettings flight enable to enable flight",
             settings.current().titleFadeInTicks(),
             settings.current().titleStayTicks(),
             settings.current().titleFadeOutTicks()
@@ -112,7 +112,7 @@ final class BaseFlightController implements Runnable {
             player.setAllowFlight(true);
             grantedFlight.add(player.getUniqueId());
         }
-        if (distanceSquared > (double) radius * radius) {
+        if (distanceSquared > (double) radius * radius && player.isFlying()) {
             if (warned.add(player.getUniqueId())) {
                 player.sendTitle(
                     ChatColor.RED + "Leaving Your Base",

src/main/java/games/dmg/spigotbase/BaseNavigationCommand.java

@@ -1,73 +0,0 @@
-package games.dmg.spigotbase;
-
-import java.util.List;
-import java.util.Locale;
-import org.bukkit.ChatColor;
-import org.bukkit.command.Command;
-import org.bukkit.command.CommandExecutor;
-import org.bukkit.command.CommandSender;
-import org.bukkit.command.TabCompleter;
-import org.bukkit.entity.Player;
-
-final class BaseNavigationCommand implements CommandExecutor, TabCompleter {
-    private static final List<String> MODES = List.of("on", "off");
-
-    private final BaseStateManager stateManager;
-
-    BaseNavigationCommand(BaseStateManager stateManager) {
-        this.stateManager = stateManager;
-    }
-
-    @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] arguments) {
-        if (!(sender instanceof Player player)) {
-            sender.sendMessage("Only players can use base navigation.");
-            return true;
-        }
-        PlayerState state = stateManager.player(player.getUniqueId(), player.getName());
-        if (state.baseLevel() < 2) {
-            player.sendMessage(ChatColor.RED + "Base II navigation is still locked.");
-            return true;
-        }
-        if (state.base().isEmpty()) {
-            player.sendMessage(ChatColor.RED + "Set your base before enabling navigation.");
-            return true;
-        }
-        final boolean enabled;
-        try {
-            enabled = NavigationPreference.resolve(state.navigationEnabled(), arguments);
-        } catch (IllegalArgumentException exception) {
-            player.sendMessage(ChatColor.RED + "Usage: /basenavigation [on|off]");
-            return true;
-        }
-        state = stateManager.update(
-            player.getUniqueId(),
-            player.getName(),
-            current -> current.withNavigationEnabled(enabled)
-        );
-        stateManager.saveIfDirty();
-        player.sendMessage(ChatColor.YELLOW + "Base navigation is now "
-            + (state.navigationEnabled() ? ChatColor.GREEN + "on" : ChatColor.RED + "off")
-            + ChatColor.YELLOW + ".");
-        if (state.navigationEnabled()
-                && !player.getWorld().getUID().equals(state.base().orElseThrow().worldId())) {
-            player.sendMessage(ChatColor.RED + "Your base is in another world: "
-                + state.base().orElseThrow().worldName() + ".");
-        }
-        return true;
-    }
-
-    @Override
-    public List<String> onTabComplete(
-        CommandSender sender,
-        Command command,
-        String alias,
-        String[] arguments
-    ) {
-        if (arguments.length != 1) {
-            return List.of();
-        }
-        String prefix = arguments[0].toLowerCase(Locale.ROOT);
-        return MODES.stream().filter(mode -> mode.startsWith(prefix)).toList();
-    }
-}

src/main/java/games/dmg/spigotbase/BaseNavigationController.java

@@ -10,6 +10,7 @@ final class BaseNavigationController implements Runnable {
     private final Server server;
     private final BaseStateManager stateManager;
     private final PluginSettingsProvider settings;
+    private final BaseBoundsService boundsService;
 
     BaseNavigationController(
         Server server,
@@ -19,6 +20,7 @@ final class BaseNavigationController implements Runnable {
         this.server = server;
         this.stateManager = stateManager;
         this.settings = settings;
+        this.boundsService = new BaseBoundsService(settings);
     }
 
     @Override
@@ -32,7 +34,16 @@ final class BaseNavigationController implements Runnable {
             if (!player.getWorld().getUID().equals(base.worldId())) {
                 continue;
             }
-            Location origin = player.getLocation().clone().add(0.0, 0.15, 0.0);
+            Location playerLocation = player.getLocation();
+            if (!BaseNavigationVisibility.isBeyondBorderBuffer(
+                    base,
+                    boundsService.radius(state),
+                    playerLocation.getX(),
+                    playerLocation.getZ()
+            )) {
+                continue;
+            }
+            Location origin = playerLocation.clone().add(0.0, 0.15, 0.0);
             Vector direction = new Vector(
                 base.x() + 0.5 - origin.getX(),
                 0.0,

src/main/java/games/dmg/spigotbase/BaseNavigationVisibility.java

@@ -0,0 +1,26 @@
+package games.dmg.spigotbase;
+
+final class BaseNavigationVisibility {
+    static final int BORDER_BUFFER = 25;
+
+    private BaseNavigationVisibility() {
+    }
+
+    static boolean isBeyondBorderBuffer(
+        BaseLocation base,
+        int radius,
+        double playerX,
+        double playerZ
+    ) {
+        if (base == null) {
+            throw new IllegalArgumentException("base is required");
+        }
+        if (radius <= 0) {
+            throw new IllegalArgumentException("base radius must be positive");
+        }
+        double deltaX = playerX - (base.x() + 0.5);
+        double deltaZ = playerZ - (base.z() + 0.5);
+        double minimumDistance = radius + BORDER_BUFFER;
+        return deltaX * deltaX + deltaZ * deltaZ > minimumDistance * minimumDistance;
+    }
+}

src/main/java/games/dmg/spigotbase/BaseProgressCommand.java

@@ -1,121 +0,0 @@
-package games.dmg.spigotbase;
-
-import org.bukkit.ChatColor;
-import org.bukkit.command.Command;
-import org.bukkit.command.CommandExecutor;
-import org.bukkit.command.CommandSender;
-import org.bukkit.entity.Player;
-
-final class BaseProgressCommand implements CommandExecutor {
-    private final BaseStateManager stateManager;
-    private final PluginSettingsProvider settings;
-    private final TeleportPolicy teleportPolicy;
-
-    BaseProgressCommand(BaseStateManager stateManager, PluginSettingsProvider settings) {
-        this.stateManager = stateManager;
-        this.settings = settings;
-        this.teleportPolicy = new TeleportPolicy(settings);
-    }
-
-    @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] arguments) {
-        if (!(sender instanceof Player player)) {
-            sender.sendMessage("Only players have base progression.");
-            return true;
-        }
-        PlayerState state = stateManager.player(player.getUniqueId(), player.getName());
-        if (arguments.length == 1 && arguments[0].equalsIgnoreCase("bossbar")) {
-            state = stateManager.update(
-                player.getUniqueId(),
-                player.getName(),
-                current -> current.withBossBarEnabled(!current.bossBarEnabled())
-            );
-            stateManager.saveIfDirty();
-            player.sendMessage(ChatColor.YELLOW + "Automatic progress boss bars are now "
-                + (state.bossBarEnabled() ? ChatColor.GREEN + "on" : ChatColor.RED + "off")
-                + ChatColor.YELLOW + ".");
-            return true;
-        }
-        player.sendMessage(ChatColor.GOLD + "=== Base Progress ===");
-        showBasePath(player, state);
-        showSizePath(player, state);
-        showFlightPath(player, state);
-        showWarmupPath(player, state);
-        showCooldownPath(player, state);
-        player.sendMessage(ChatColor.GRAY + "Boss bars: " + (state.bossBarEnabled() ? "on" : "off"));
-        state.base().ifPresentOrElse(
-            base -> player.sendMessage(ChatColor.GRAY + "Base: " + base.worldName() + " "
-                + base.x() + ", " + base.y() + ", " + base.z()),
-            () -> player.sendMessage(ChatColor.GRAY + "Base: not set")
-        );
-        return true;
-    }
-
-    private void showBasePath(Player player, PlayerState state) {
-        String detail = switch (state.baseLevel()) {
-            case 0 -> state.grassAndDirtBroken() + "/" + settings.current().baseUnlockBlocks()
-                + " grass or dirt → /setbase";
-            case 1 -> state.grassAndDirtBroken() + "/" + settings.current().navigationUnlockBlocks()
-                + " grass or dirt → navigation";
-            case 2 -> state.blocksPlacedInBase() + "/" + settings.current().teleportUnlockPlacements()
-                + " placements → /base";
-            case 3 -> settings.current().visitorUnlockDiamondCost() + " diamonds → visitor access";
-            case 4 -> "complete; visitor access unlocked";
-            default -> "invalid";
-        };
-        player.sendMessage(ChatColor.YELLOW + "Base " + state.baseLevel() + "/4: "
-            + ChatColor.GRAY + detail);
-    }
-
-    private void showSizePath(Player player, PlayerState state) {
-        String detail = switch (state.sizeLevel()) {
-            case 0 -> state.stoneBroken() + "/" + settings.current().stoneExpansionBlocks() + " stone";
-            case 1 -> state.deepslateBroken() + "/" + settings.current().deepslateExpansionBlocks() + " deepslate";
-            case 2 -> state.obsidianBroken() + "/" + settings.current().obsidianExpansionBlocks() + " obsidian";
-            case 3 -> "complete; 150-block radius by default";
-            default -> "invalid";
-        };
-        player.sendMessage(colorForPrerequisite(state.baseLevel() >= 1) + "Base Size "
-            + state.sizeLevel() + "/3: " + ChatColor.GRAY + detail);
-    }
-
-    private void showFlightPath(Player player, PlayerState state) {
-        String detail = state.flightLevel() >= 3
-            ? "complete; world build height"
-            : (state.flightLevel() + 1) + " simultaneous elytra required";
-        player.sendMessage(colorForPrerequisite(state.baseLevel() >= 1) + "Base Flight "
-            + state.flightLevel() + "/3: " + ChatColor.GRAY + detail
-            + "; toggle=" + (state.flightEnabled() ? "on" : "off"));
-    }
-
-    private void showWarmupPath(Player player, PlayerState state) {
-        String detail = switch (state.warmupLevel()) {
-            case 0 -> state.blocksPlacedInBase() + "/" + settings.current().secondWarmupPlacements();
-            case 1 -> state.blocksPlacedInBase() + "/" + settings.current().thirdWarmupPlacements();
-            case 2 -> state.blocksPlacedInBase() + "/" + settings.current().instantWarmupPlacements();
-            case 3 -> "complete";
-            default -> "invalid";
-        };
-        player.sendMessage(colorForPrerequisite(state.baseLevel() >= 3) + "Teleport Warm-up "
-            + state.warmupLevel() + "/3: " + ChatColor.GRAY
-            + DurationFormatter.friendly(teleportPolicy.warmup(state)) + "; " + detail);
-    }
-
-    private void showCooldownPath(Player player, PlayerState state) {
-        String detail = switch (state.cooldownLevel()) {
-            case 0 -> state.blocksBrokenInBase() + "/" + settings.current().firstCooldownBreaks();
-            case 1 -> state.blocksBrokenInBase() + "/" + settings.current().secondCooldownBreaks();
-            case 2 -> state.blocksBrokenInBase() + "/" + settings.current().thirdCooldownBreaks();
-            case 3 -> state.blocksBrokenInBase() + "/" + settings.current().instantCooldownBreaks();
-            case 4 -> "complete";
-            default -> "invalid";
-        };
-        player.sendMessage(colorForPrerequisite(state.baseLevel() >= 3) + "Teleport Cooldown "
-            + state.cooldownLevel() + "/4: " + ChatColor.GRAY
-            + DurationFormatter.friendly(teleportPolicy.cooldown(state)) + "; " + detail);
-    }
-
-    private static ChatColor colorForPrerequisite(boolean met) {
-        return met ? ChatColor.YELLOW : ChatColor.RED;
-    }
-}

src/main/java/games/dmg/spigotbase/BaseProgressListener.java

@@ -24,6 +24,7 @@ final class BaseProgressListener implements Listener {
     private final BaseProgressionService baseProgressionService;
     private final SecondaryProgressionService secondaryProgressionService;
     private final TeleportProgressionService teleportProgressionService;
+    private final SpawnableOverlayProgressionService spawnableOverlayProgressionService;
     private final BaseBoundsService boundsService;
     private final PluginSettingsProvider settings;
     private final Map<UUID, BossBar> activeBossBars = new HashMap<>();
@@ -34,6 +35,7 @@ final class BaseProgressListener implements Listener {
         BaseProgressionService baseProgressionService,
         SecondaryProgressionService secondaryProgressionService,
         TeleportProgressionService teleportProgressionService,
+        SpawnableOverlayProgressionService spawnableOverlayProgressionService,
         BaseBoundsService boundsService,
         PluginSettingsProvider settings
     ) {
@@ -42,6 +44,7 @@ final class BaseProgressListener implements Listener {
         this.baseProgressionService = baseProgressionService;
         this.secondaryProgressionService = secondaryProgressionService;
         this.teleportProgressionService = teleportProgressionService;
+        this.spawnableOverlayProgressionService = spawnableOverlayProgressionService;
         this.boundsService = boundsService;
         this.settings = settings;
     }
@@ -97,26 +100,43 @@ final class BaseProgressListener implements Listener {
             return;
         }
         PlayerState before = stateManager.player(player.getUniqueId(), player.getName());
-        if (!isInsideBase(
-                before,
-                event.getBlockPlaced().getWorld().getUID(),
-                event.getBlockPlaced().getX(),
-                event.getBlockPlaced().getY(),
-                event.getBlockPlaced().getZ())) {
-            return;
-        }
+        boolean insideBase = isInsideBase(
+            before,
+            event.getBlockPlaced().getWorld().getUID(),
+            event.getBlockPlaced().getX(),
+            event.getBlockPlaced().getY(),
+            event.getBlockPlaced().getZ()
+        );
         ProgressionUpdate[] updateHolder = new ProgressionUpdate[1];
+        SpawnableOverlayProgressionUpdate[] overlayHolder =
+            new SpawnableOverlayProgressionUpdate[1];
         PlayerState state = stateManager.update(player.getUniqueId(), player.getName(), current -> {
-            ProgressionUpdate update = teleportProgressionService.recordPlacement(current);
+            SpawnableOverlayProgressionUpdate overlay =
+                spawnableOverlayProgressionService.recordPlacement(current);
+            ProgressionUpdate update = insideBase
+                ? teleportProgressionService.recordPlacement(overlay.player())
+                : ProgressionUpdate.unchanged(overlay.player());
+            overlayHolder[0] = overlay;
             updateHolder[0] = update;
             return update.player();
         });
         ProgressionUpdate update = updateHolder[0];
+        SpawnableOverlayProgressionUpdate overlay = overlayHolder[0];
         announceUnlock(player, update);
-        if (hasUnlock(update)) {
+        if (overlay.unlocked()) {
+            sendUnlockTitle(
+                player,
+                ChatColor.GOLD + "Spawnable Overlay Unlocked",
+                ChatColor.YELLOW + "/basesettings spawnable enable is now available"
+            );
+            player.sendMessage(ChatColor.GREEN
+                + "You unlocked spawnable block highlighting! Use "
+                + "/basesettings spawnable enable.");
+        }
+        if (hasUnlock(update) || overlay.unlocked()) {
             stateManager.saveIfDirty();
         }
-        if (state.bossBarEnabled() && state.baseLevel() >= 2) {
+        if (insideBase && state.bossBarEnabled() && state.baseLevel() >= 2) {
             showProgress(player, warmupDisplay(state));
         }
     }
@@ -149,7 +169,7 @@ final class BaseProgressListener implements Listener {
             int level = update.player().baseLevel();
             String subtitle = switch (level) {
                 case 1 -> "/setbase is now available";
-                case 2 -> "/basenavigation is now available";
+                case 2 -> "/basesettings navigation enable is now available";
                 case 3 -> "/base is now available";
                 case 4 -> "Visitors can now travel to your base";
                 default -> "A new base benefit is available";

src/main/java/games/dmg/spigotbase/BaseSettingsCommand.java

@@ -0,0 +1,445 @@
+package games.dmg.spigotbase;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Locale;
+import org.bukkit.ChatColor;
+import org.bukkit.Material;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.TabCompleter;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.PlayerInventory;
+
+final class BaseSettingsCommand implements CommandExecutor, TabCompleter {
+    private static final List<String> SETTINGS = List.of(
+        "status", "upgrade", "visitors", "navigation", "flight", "border", "spawnable",
+        "bossbar"
+    );
+    private static final List<String> VISITOR_MODES = List.of("allowed", "blocked");
+    private static final List<String> ENABLE_MODES = List.of("enable", "disable");
+    private final BaseStateManager stateManager;
+    private final PluginSettingsProvider settings;
+    private final TeleportPolicy teleportPolicy;
+    private final BaseFlightController flightController;
+
+    BaseSettingsCommand(
+        BaseStateManager stateManager,
+        PluginSettingsProvider settings,
+        BaseFlightController flightController
+    ) {
+        this.stateManager = stateManager;
+        this.settings = settings;
+        this.teleportPolicy = new TeleportPolicy(settings);
+        this.flightController = flightController;
+    }
+
+    @Override
+    public boolean onCommand(CommandSender sender, Command command, String label, String[] arguments) {
+        if (!(sender instanceof Player player)) {
+            sender.sendMessage("Only players have base progression.");
+            return true;
+        }
+        PlayerState state = stateManager.player(player.getUniqueId(), player.getName());
+        if (arguments.length == 0
+                || arguments.length == 1 && arguments[0].equalsIgnoreCase("status")) {
+            showStatus(player, state);
+            return true;
+        }
+        if (arguments.length == 1 && arguments[0].equalsIgnoreCase("upgrade")) {
+            return purchaseVisitorAccess(player, state);
+        }
+        if (arguments.length == 2 && arguments[0].equalsIgnoreCase("visitors")) {
+            return updateVisitors(player, state, arguments[1]);
+        }
+        if (arguments.length == 2 && arguments[0].equalsIgnoreCase("navigation")) {
+            return updateNavigation(player, state, arguments[1]);
+        }
+        if (arguments.length == 2 && arguments[0].equalsIgnoreCase("flight")) {
+            return updateFlight(player, state, arguments[1]);
+        }
+        if (arguments.length == 2 && arguments[0].equalsIgnoreCase("border")) {
+            return updateBorder(player, state, arguments[1]);
+        }
+        if (arguments.length == 2 && arguments[0].equalsIgnoreCase("spawnable")) {
+            return updateSpawnableOverlay(player, state, arguments[1]);
+        }
+        if (arguments.length == 2 && arguments[0].equalsIgnoreCase("bossbar")) {
+            return updateBossBar(player, arguments[1]);
+        }
+        sendUsage(player);
+        return true;
+    }
+
+    private boolean purchaseVisitorAccess(Player player, PlayerState state) {
+        if (!new VisitorPolicy().canPurchase(state)) {
+            player.sendMessage(ChatColor.RED + (state.baseLevel() >= 4
+                ? "Base IV is already unlocked."
+                : "You must unlock Base III before purchasing Base IV."));
+            return true;
+        }
+        int price = settings.current().visitorUnlockDiamondCost();
+        Material currency = Material.valueOf(settings.current().visitorCurrencyMaterial());
+        PlayerInventory inventory = player.getInventory();
+        if (countCurrency(inventory, currency) < price) {
+            player.sendMessage(ChatColor.RED + "Base IV costs " + price + " "
+                + currency.name().toLowerCase(java.util.Locale.ROOT) + ".");
+            return true;
+        }
+        ItemStack[] snapshot = cloneContents(inventory.getStorageContents());
+        removeCurrency(inventory, currency, price);
+        try {
+            stateManager.updateAndSave(
+                player.getUniqueId(),
+                player.getName(),
+                current -> current.withBaseLevel(4).withVisitorsEnabled(true)
+            );
+        } catch (IOException | RuntimeException exception) {
+            inventory.setStorageContents(snapshot);
+            player.sendMessage(ChatColor.RED
+                + "The upgrade could not be saved; your diamonds were restored.");
+            return true;
+        }
+        player.sendTitle(
+            ChatColor.GOLD + "Base IV Unlocked",
+            ChatColor.YELLOW + "Visitors may now teleport to your base",
+            settings.current().titleFadeInTicks(),
+            settings.current().titleStayTicks(),
+            settings.current().titleFadeOutTicks()
+        );
+        player.sendMessage(ChatColor.GREEN + "Base IV unlocked for " + price + " "
+            + currency.name().toLowerCase(java.util.Locale.ROOT) + ".");
+        return true;
+    }
+
+    private boolean updateVisitors(Player player, PlayerState state, String mode) {
+        if (state.baseLevel() < 4) {
+            player.sendMessage(ChatColor.RED + "Base IV visitor access is still locked.");
+            return true;
+        }
+        final boolean enabled;
+        if (mode.equalsIgnoreCase("allowed")) {
+            enabled = true;
+        } else if (mode.equalsIgnoreCase("blocked")) {
+            enabled = false;
+        } else {
+            sendUsage(player);
+            return true;
+        }
+        state = stateManager.update(
+            player.getUniqueId(),
+            player.getName(),
+            current -> current.withVisitorsEnabled(enabled)
+        );
+        stateManager.saveIfDirty();
+        player.sendMessage(ChatColor.YELLOW + "Visitor teleports are now "
+            + (state.visitorsEnabled() ? ChatColor.GREEN + "allowed" : ChatColor.RED + "blocked")
+            + ChatColor.YELLOW + ".");
+        return true;
+    }
+
+    private boolean updateNavigation(Player player, PlayerState state, String mode) {
+        if (state.baseLevel() < 2) {
+            player.sendMessage(ChatColor.RED + "Base II navigation is still locked.");
+            return true;
+        }
+        if (state.base().isEmpty()) {
+            player.sendMessage(ChatColor.RED + "Set your base before enabling navigation.");
+            return true;
+        }
+        Boolean enabled = enabledMode(mode);
+        if (enabled == null) {
+            sendUsage(player);
+            return true;
+        }
+        state = stateManager.update(
+            player.getUniqueId(),
+            player.getName(),
+            current -> current.withNavigationEnabled(enabled)
+        );
+        stateManager.saveIfDirty();
+        player.sendMessage(ChatColor.YELLOW + "Base navigation is now "
+            + (state.navigationEnabled() ? ChatColor.GREEN + "enabled" : ChatColor.RED + "disabled")
+            + ChatColor.YELLOW + ".");
+        if (state.navigationEnabled()
+                && !player.getWorld().getUID().equals(state.base().orElseThrow().worldId())) {
+            player.sendMessage(ChatColor.RED + "Your base is in another world: "
+                + state.base().orElseThrow().worldName() + ".");
+        }
+        return true;
+    }
+
+    private boolean updateFlight(Player player, PlayerState state, String mode) {
+        if (state.flightLevel() < 1) {
+            player.sendMessage(ChatColor.RED + "Base flight is still locked.");
+            return true;
+        }
+        Boolean enabled = enabledMode(mode);
+        if (enabled == null) {
+            sendUsage(player);
+            return true;
+        }
+        state = stateManager.update(
+            player.getUniqueId(),
+            player.getName(),
+            current -> current.withFlightEnabled(enabled)
+        );
+        if (!state.flightEnabled()) {
+            flightController.removeGrantedFlight(player);
+        }
+        stateManager.saveIfDirty();
+        player.sendMessage(ChatColor.YELLOW + "Base flight is now "
+            + (state.flightEnabled() ? ChatColor.GREEN + "enabled" : ChatColor.RED + "disabled")
+            + ChatColor.YELLOW + ".");
+        return true;
+    }
+
+    private boolean updateBorder(Player player, PlayerState state, String mode) {
+        if (state.baseLevel() < 1 || state.base().isEmpty()) {
+            player.sendMessage(ChatColor.RED
+                + "Establish Base I before enabling border visualization.");
+            return true;
+        }
+        Boolean enabled = enabledMode(mode);
+        if (enabled == null) {
+            sendUsage(player);
+            return true;
+        }
+        state = stateManager.update(
+            player.getUniqueId(),
+            player.getName(),
+            current -> current.withBorderEnabled(enabled)
+        );
+        stateManager.saveIfDirty();
+        player.sendMessage(ChatColor.YELLOW + "Base border visualization is now "
+            + (state.borderEnabled() ? ChatColor.GREEN + "enabled" : ChatColor.RED + "disabled")
+            + ChatColor.YELLOW + ".");
+        return true;
+    }
+
+    private boolean updateSpawnableOverlay(Player player, PlayerState state, String mode) {
+        if (state.totalBlocksPlaced() < settings.current().spawnableOverlayUnlockPlacements()) {
+            player.sendMessage(ChatColor.RED + "Spawnable highlighting unlocks after "
+                + settings.current().spawnableOverlayUnlockPlacements() + " total placements.");
+            return true;
+        }
+        if (state.baseLevel() < 1 || state.base().isEmpty()) {
+            player.sendMessage(ChatColor.RED
+                + "Establish Base I before enabling spawnable highlighting.");
+            return true;
+        }
+        Boolean enabled = enabledMode(mode);
+        if (enabled == null) {
+            sendUsage(player);
+            return true;
+        }
+        state = stateManager.update(
+            player.getUniqueId(),
+            player.getName(),
+            current -> current.withSpawnableOverlayEnabled(enabled)
+        );
+        stateManager.saveIfDirty();
+        player.sendMessage(ChatColor.YELLOW + "Spawnable block highlighting is now "
+            + (state.spawnableOverlayEnabled()
+                ? ChatColor.GREEN + "enabled"
+                : ChatColor.RED + "disabled")
+            + ChatColor.YELLOW + ".");
+        return true;
+    }
+
+    private boolean updateBossBar(Player player, String mode) {
+        Boolean enabled = enabledMode(mode);
+        if (enabled == null) {
+            sendUsage(player);
+            return true;
+        }
+        PlayerState state = stateManager.update(
+            player.getUniqueId(),
+            player.getName(),
+            current -> current.withBossBarEnabled(enabled)
+        );
+        stateManager.saveIfDirty();
+        player.sendMessage(ChatColor.YELLOW + "Automatic progress boss bars are now "
+            + (state.bossBarEnabled() ? ChatColor.GREEN + "enabled" : ChatColor.RED + "disabled")
+            + ChatColor.YELLOW + ".");
+        return true;
+    }
+
+    private void showStatus(Player player, PlayerState state) {
+        player.sendMessage(ChatColor.GOLD + "=== Base Progress ===");
+        showBasePath(player, state);
+        showSizePath(player, state);
+        showFlightPath(player, state);
+        showWarmupPath(player, state);
+        showCooldownPath(player, state);
+        int spawnableThreshold = settings.current().spawnableOverlayUnlockPlacements();
+        player.sendMessage(ChatColor.YELLOW + "Spawnable Overlay: " + ChatColor.GRAY
+            + state.totalBlocksPlaced() + "/" + spawnableThreshold + " placements; "
+            + (state.totalBlocksPlaced() >= spawnableThreshold ? "unlocked" : "locked")
+            + "; setting=" + (state.spawnableOverlayEnabled() ? "enabled" : "disabled"));
+        player.sendMessage(ChatColor.GRAY + "Settings: visitors="
+            + (state.visitorsEnabled() ? "allowed" : "blocked")
+            + " navigation=" + (state.navigationEnabled() ? "enabled" : "disabled")
+            + " flight=" + (state.flightEnabled() ? "enabled" : "disabled")
+            + " border=" + (state.borderEnabled() ? "enabled" : "disabled")
+            + " spawnable=" + (state.spawnableOverlayEnabled() ? "enabled" : "disabled")
+            + " bossbar=" + (state.bossBarEnabled() ? "enabled" : "disabled"));
+        state.base().ifPresentOrElse(
+            base -> player.sendMessage(ChatColor.GRAY + "Base: " + base.worldName() + " "
+                + base.x() + ", " + base.y() + ", " + base.z()),
+            () -> player.sendMessage(ChatColor.GRAY + "Base: not set")
+        );
+    }
+
+    private void showBasePath(Player player, PlayerState state) {
+        String detail = switch (state.baseLevel()) {
+            case 0 -> state.grassAndDirtBroken() + "/" + settings.current().baseUnlockBlocks()
+                + " grass or dirt → /setbase";
+            case 1 -> state.grassAndDirtBroken() + "/" + settings.current().navigationUnlockBlocks()
+                + " grass or dirt → navigation";
+            case 2 -> state.blocksPlacedInBase() + "/" + settings.current().teleportUnlockPlacements()
+                + " placements → /base";
+            case 3 -> settings.current().visitorUnlockDiamondCost()
+                + " diamonds → /basesettings upgrade";
+            case 4 -> "complete; visitor access unlocked";
+            default -> "invalid";
+        };
+        player.sendMessage(ChatColor.YELLOW + "Base " + state.baseLevel() + "/4: "
+            + ChatColor.GRAY + detail);
+    }
+
+    private void showSizePath(Player player, PlayerState state) {
+        String detail = switch (state.sizeLevel()) {
+            case 0 -> state.stoneBroken() + "/" + settings.current().stoneExpansionBlocks() + " stone";
+            case 1 -> state.deepslateBroken() + "/" + settings.current().deepslateExpansionBlocks() + " deepslate";
+            case 2 -> state.obsidianBroken() + "/" + settings.current().obsidianExpansionBlocks() + " obsidian";
+            case 3 -> "complete; 150-block radius by default";
+            default -> "invalid";
+        };
+        player.sendMessage(colorForPrerequisite(state.baseLevel() >= 1) + "Base Size "
+            + state.sizeLevel() + "/3: " + ChatColor.GRAY + detail);
+    }
+
+    private void showFlightPath(Player player, PlayerState state) {
+        String detail = state.flightLevel() >= 3
+            ? "complete; world build height"
+            : (state.flightLevel() + 1) + " simultaneous elytra required";
+        player.sendMessage(colorForPrerequisite(state.baseLevel() >= 1) + "Base Flight "
+            + state.flightLevel() + "/3: " + ChatColor.GRAY + detail
+            + "; setting=" + (state.flightEnabled() ? "enabled" : "disabled"));
+    }
+
+    private void showWarmupPath(Player player, PlayerState state) {
+        String detail = switch (state.warmupLevel()) {
+            case 0 -> state.blocksPlacedInBase() + "/" + settings.current().secondWarmupPlacements();
+            case 1 -> state.blocksPlacedInBase() + "/" + settings.current().thirdWarmupPlacements();
+            case 2 -> state.blocksPlacedInBase() + "/" + settings.current().instantWarmupPlacements();
+            case 3 -> "complete";
+            default -> "invalid";
+        };
+        player.sendMessage(colorForPrerequisite(state.baseLevel() >= 3) + "Teleport Warm-up "
+            + state.warmupLevel() + "/3: " + ChatColor.GRAY
+            + DurationFormatter.friendly(teleportPolicy.warmup(state)) + "; " + detail);
+    }
+
+    private void showCooldownPath(Player player, PlayerState state) {
+        String detail = switch (state.cooldownLevel()) {
+            case 0 -> state.blocksBrokenInBase() + "/" + settings.current().firstCooldownBreaks();
+            case 1 -> state.blocksBrokenInBase() + "/" + settings.current().secondCooldownBreaks();
+            case 2 -> state.blocksBrokenInBase() + "/" + settings.current().thirdCooldownBreaks();
+            case 3 -> state.blocksBrokenInBase() + "/" + settings.current().instantCooldownBreaks();
+            case 4 -> "complete";
+            default -> "invalid";
+        };
+        player.sendMessage(colorForPrerequisite(state.baseLevel() >= 3) + "Teleport Cooldown "
+            + state.cooldownLevel() + "/4: " + ChatColor.GRAY
+            + DurationFormatter.friendly(teleportPolicy.cooldown(state)) + "; " + detail);
+    }
+
+    @Override
+    public List<String> onTabComplete(
+        CommandSender sender,
+        Command command,
+        String alias,
+        String[] arguments
+    ) {
+        if (arguments.length == 1) {
+            String prefix = arguments[0].toLowerCase(Locale.ROOT);
+            return SETTINGS.stream().filter(setting -> setting.startsWith(prefix)).toList();
+        }
+        if (arguments.length == 2) {
+            List<String> modes = arguments[0].equalsIgnoreCase("visitors")
+                ? VISITOR_MODES
+                : switch (arguments[0].toLowerCase(Locale.ROOT)) {
+                    case "navigation", "flight", "border", "spawnable", "bossbar" -> ENABLE_MODES;
+                    default -> List.of();
+                };
+            String prefix = arguments[1].toLowerCase(Locale.ROOT);
+            return modes.stream().filter(mode -> mode.startsWith(prefix)).toList();
+        }
+        return List.of();
+    }
+
+    private static int countCurrency(PlayerInventory inventory, Material currency) {
+        int count = 0;
+        for (ItemStack item : inventory.getStorageContents()) {
+            if (item != null && item.getType() == currency) {
+                count += item.getAmount();
+            }
+        }
+        return count;
+    }
+
+    private static void removeCurrency(PlayerInventory inventory, Material currency, int amount) {
+        ItemStack[] contents = inventory.getStorageContents();
+        int remaining = amount;
+        for (int index = 0; index < contents.length && remaining > 0; index++) {
+            ItemStack item = contents[index];
+            if (item == null || item.getType() != currency) {
+                continue;
+            }
+            int removed = Math.min(remaining, item.getAmount());
+            remaining -= removed;
+            int newAmount = item.getAmount() - removed;
+            if (newAmount == 0) {
+                contents[index] = null;
+            } else {
+                ItemStack reduced = item.clone();
+                reduced.setAmount(newAmount);
+                contents[index] = reduced;
+            }
+        }
+        inventory.setStorageContents(contents);
+    }
+
+    private static ItemStack[] cloneContents(ItemStack[] contents) {
+        ItemStack[] copy = new ItemStack[contents.length];
+        for (int index = 0; index < contents.length; index++) {
+            copy[index] = contents[index] == null ? null : contents[index].clone();
+        }
+        return copy;
+    }
+
+    private static Boolean enabledMode(String mode) {
+        if (mode.equalsIgnoreCase("enable")) {
+            return true;
+        }
+        if (mode.equalsIgnoreCase("disable")) {
+            return false;
+        }
+        return null;
+    }
+
+    private static ChatColor colorForPrerequisite(boolean met) {
+        return met ? ChatColor.YELLOW : ChatColor.RED;
+    }
+
+    private static void sendUsage(Player player) {
+        player.sendMessage(ChatColor.RED + "Usage: /basesettings "
+            + "[status|upgrade|visitors <allowed|blocked>|navigation <enable|disable>"
+            + "|flight <enable|disable>|border <enable|disable>"
+            + "|spawnable <enable|disable>|bossbar <enable|disable>]");
+    }
+}

src/main/java/games/dmg/spigotbase/BaseTeleportManager.java

@@ -189,7 +189,7 @@ final class BaseTeleportManager implements Listener {
     public void onCommand(PlayerCommandPreprocessEvent event) {
         String command = event.getMessage().toLowerCase(Locale.ROOT).split("\\s+", 2)[0];
         if (command.equals("/base") || command.equals("/gotobase")
-                || command.equals("/spawn") || command.equals("/home")
+                || command.equals("/visit") || command.equals("/spawn") || command.equals("/home")
                 || command.equals("/tp") || command.equals("/teleport")) {
             cancel(event.getPlayer(), "Base teleport cancelled by another teleport command.");
         }

src/main/java/games/dmg/spigotbase/BaseVisitorsCommand.java

@@ -1,38 +0,0 @@
-package games.dmg.spigotbase;
-
-import org.bukkit.ChatColor;
-import org.bukkit.command.Command;
-import org.bukkit.command.CommandExecutor;
-import org.bukkit.command.CommandSender;
-import org.bukkit.entity.Player;
-
-final class BaseVisitorsCommand implements CommandExecutor {
-    private final BaseStateManager stateManager;
-
-    BaseVisitorsCommand(BaseStateManager stateManager) {
-        this.stateManager = stateManager;
-    }
-
-    @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] arguments) {
-        if (!(sender instanceof Player player)) {
-            sender.sendMessage("Only players can manage base visitors.");
-            return true;
-        }
-        PlayerState state = stateManager.player(player.getUniqueId(), player.getName());
-        if (state.baseLevel() < 4) {
-            player.sendMessage(ChatColor.RED + "Base IV visitor access is still locked.");
-            return true;
-        }
-        state = stateManager.update(
-            player.getUniqueId(),
-            player.getName(),
-            current -> current.withVisitorsEnabled(!current.visitorsEnabled())
-        );
-        stateManager.saveIfDirty();
-        player.sendMessage(ChatColor.YELLOW + "Visitor teleports are now "
-            + (state.visitorsEnabled() ? ChatColor.GREEN + "on" : ChatColor.RED + "off")
-            + ChatColor.YELLOW + ".");
-        return true;
-    }
-}

src/main/java/games/dmg/spigotbase/NavigationPreference.java

@@ -1,22 +0,0 @@
-package games.dmg.spigotbase;
-
-import java.util.Locale;
-
-final class NavigationPreference {
-    private NavigationPreference() {
-    }
-
-    static boolean resolve(boolean current, String[] arguments) {
-        if (arguments.length == 0) {
-            return !current;
-        }
-        if (arguments.length != 1) {
-            throw new IllegalArgumentException("expected zero or one argument");
-        }
-        return switch (arguments[0].toLowerCase(Locale.ROOT)) {
-            case "on" -> true;
-            case "off" -> false;
-            default -> throw new IllegalArgumentException("expected on or off");
-        };
-    }
-}

src/main/java/games/dmg/spigotbase/PlayerState.java

@@ -26,7 +26,10 @@ public record PlayerState(
     boolean visitorsEnabled,
     Optional<Instant> lastBaseSet,
     Optional<Instant> lastBaseTeleport,
-    Map<UUID, Instant> visitorCooldownUntil
+    Map<UUID, Instant> visitorCooldownUntil,
+    boolean borderEnabled,
+    long totalBlocksPlaced,
+    boolean spawnableOverlayEnabled
 ) {
     public PlayerState {
         if (playerId == null) {
@@ -53,6 +56,7 @@ public record PlayerState(
         requireNonNegative(obsidianBroken, "obsidian broken");
         requireNonNegative(blocksPlacedInBase, "blocks placed in base");
         requireNonNegative(blocksBrokenInBase, "blocks broken in base");
+        requireNonNegative(totalBlocksPlaced, "total blocks placed");
 
         if (baseLevel == 0 && (sizeLevel > 0 || flightLevel > 0)) {
             throw new IllegalArgumentException("secondary progression requires Base I");
@@ -69,12 +73,83 @@ public record PlayerState(
         if (baseLevel < 4 && visitorsEnabled) {
             throw new IllegalArgumentException("visitor access requires Base IV");
         }
+        if (borderEnabled && (baseLevel < 1 || base.isEmpty())) {
+            throw new IllegalArgumentException("border visualization requires an established Base I");
+        }
+        if (spawnableOverlayEnabled && (baseLevel < 1 || base.isEmpty())) {
+            throw new IllegalArgumentException("spawnable overlay requires an established Base I");
+        }
         if (visitorCooldownUntil.entrySet().stream().anyMatch(entry ->
                 entry.getKey() == null || entry.getValue() == null)) {
             throw new IllegalArgumentException("visitor cooldowns must be complete");
         }
     }
 
+    public PlayerState(
+        UUID playerId,
+        String latestName,
+        Optional<BaseLocation> base,
+        int baseLevel,
+        int sizeLevel,
+        int flightLevel,
+        int warmupLevel,
+        int cooldownLevel,
+        long grassAndDirtBroken,
+        long stoneBroken,
+        long deepslateBroken,
+        long obsidianBroken,
+        long blocksPlacedInBase,
+        long blocksBrokenInBase,
+        boolean navigationEnabled,
+        boolean flightEnabled,
+        boolean bossBarEnabled,
+        boolean visitorsEnabled,
+        Optional<Instant> lastBaseSet,
+        Optional<Instant> lastBaseTeleport,
+        Map<UUID, Instant> visitorCooldownUntil
+    ) {
+        this(
+            playerId, latestName, base, baseLevel, sizeLevel, flightLevel,
+            warmupLevel, cooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
+            obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
+            navigationEnabled, flightEnabled, bossBarEnabled, visitorsEnabled,
+            lastBaseSet, lastBaseTeleport, visitorCooldownUntil, false, 0, false
+        );
+    }
+
+    public PlayerState(
+        UUID playerId,
+        String latestName,
+        Optional<BaseLocation> base,
+        int baseLevel,
+        int sizeLevel,
+        int flightLevel,
+        int warmupLevel,
+        int cooldownLevel,
+        long grassAndDirtBroken,
+        long stoneBroken,
+        long deepslateBroken,
+        long obsidianBroken,
+        long blocksPlacedInBase,
+        long blocksBrokenInBase,
+        boolean navigationEnabled,
+        boolean flightEnabled,
+        boolean bossBarEnabled,
+        boolean visitorsEnabled,
+        Optional<Instant> lastBaseSet,
+        Optional<Instant> lastBaseTeleport,
+        Map<UUID, Instant> visitorCooldownUntil,
+        boolean borderEnabled
+    ) {
+        this(
+            playerId, latestName, base, baseLevel, sizeLevel, flightLevel,
+            warmupLevel, cooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
+            obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
+            navigationEnabled, flightEnabled, bossBarEnabled, visitorsEnabled,
+            lastBaseSet, lastBaseTeleport, visitorCooldownUntil, borderEnabled, 0, false
+        );
+    }
+
     public static PlayerState newPlayer(UUID playerId, String latestName) {
         return new PlayerState(
             playerId,
@@ -93,7 +168,8 @@ public record PlayerState(
             warmupLevel, cooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
             obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
             navigationEnabled, flightEnabled, bossBarEnabled, visitorsEnabled,
-            lastBaseSet, lastBaseTeleport, visitorCooldownUntil
+            lastBaseSet, lastBaseTeleport, visitorCooldownUntil, borderEnabled,
+            totalBlocksPlaced, spawnableOverlayEnabled
         );
     }
 
@@ -103,7 +179,8 @@ public record PlayerState(
             warmupLevel, cooldownLevel, count, stoneBroken, deepslateBroken,
             obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
             navigationEnabled, flightEnabled, bossBarEnabled, visitorsEnabled,
-            lastBaseSet, lastBaseTeleport, visitorCooldownUntil
+            lastBaseSet, lastBaseTeleport, visitorCooldownUntil, borderEnabled,
+            totalBlocksPlaced, spawnableOverlayEnabled
         );
     }
 
@@ -113,7 +190,8 @@ public record PlayerState(
             warmupLevel, cooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
             obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
             navigationEnabled, flightEnabled, enabled, visitorsEnabled,
-            lastBaseSet, lastBaseTeleport, visitorCooldownUntil
+            lastBaseSet, lastBaseTeleport, visitorCooldownUntil, borderEnabled,
+            totalBlocksPlaced, spawnableOverlayEnabled
         );
     }
 
@@ -123,7 +201,8 @@ public record PlayerState(
             warmupLevel, cooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
             obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
             enabled, flightEnabled, bossBarEnabled, visitorsEnabled,
-            lastBaseSet, lastBaseTeleport, visitorCooldownUntil
+            lastBaseSet, lastBaseTeleport, visitorCooldownUntil, borderEnabled,
+            totalBlocksPlaced, spawnableOverlayEnabled
         );
     }
 
@@ -133,7 +212,8 @@ public record PlayerState(
             warmupLevel, cooldownLevel, grassAndDirtBroken, stone, deepslate,
             obsidian, blocksPlacedInBase, blocksBrokenInBase,
             navigationEnabled, flightEnabled, bossBarEnabled, visitorsEnabled,
-            lastBaseSet, lastBaseTeleport, visitorCooldownUntil
+            lastBaseSet, lastBaseTeleport, visitorCooldownUntil, borderEnabled,
+            totalBlocksPlaced, spawnableOverlayEnabled
         );
     }
 
@@ -143,7 +223,8 @@ public record PlayerState(
             warmupLevel, cooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
             obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
             navigationEnabled, enabled, bossBarEnabled, visitorsEnabled,
-            lastBaseSet, lastBaseTeleport, visitorCooldownUntil
+            lastBaseSet, lastBaseTeleport, visitorCooldownUntil, borderEnabled,
+            totalBlocksPlaced, spawnableOverlayEnabled
         );
     }
 
@@ -163,7 +244,8 @@ public record PlayerState(
             newWarmupLevel, newCooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
             obsidianBroken, placements, breaks,
             navigationEnabled, flightEnabled, bossBarEnabled, visitorsEnabled,
-            lastBaseSet, lastBaseTeleport, visitorCooldownUntil
+            lastBaseSet, lastBaseTeleport, visitorCooldownUntil, borderEnabled,
+            totalBlocksPlaced, spawnableOverlayEnabled
         );
     }
 
@@ -179,7 +261,8 @@ public record PlayerState(
             warmupLevel, cooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
             obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
             navigationEnabled, flightEnabled, bossBarEnabled, visitorsEnabled,
-            lastBaseSet, Optional.of(usedAt), visitorCooldownUntil
+            lastBaseSet, Optional.of(usedAt), visitorCooldownUntil, borderEnabled,
+            totalBlocksPlaced, spawnableOverlayEnabled
         );
     }
 
@@ -189,7 +272,8 @@ public record PlayerState(
             warmupLevel, cooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
             obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
             navigationEnabled, flightEnabled, bossBarEnabled, visitorsEnabled,
-            lastBaseSet, lastBaseTeleport, visitorCooldownUntil
+            lastBaseSet, lastBaseTeleport, visitorCooldownUntil, borderEnabled,
+            totalBlocksPlaced, spawnableOverlayEnabled
         );
     }
 
@@ -206,7 +290,8 @@ public record PlayerState(
             warmupLevel, cooldownLevel, grassDirt, stone, deepslate,
             obsidian, placements, baseBreaks,
             navigationEnabled, flightEnabled, bossBarEnabled, visitorsEnabled,
-            lastBaseSet, lastBaseTeleport, visitorCooldownUntil
+            lastBaseSet, lastBaseTeleport, visitorCooldownUntil, borderEnabled,
+            totalBlocksPlaced, spawnableOverlayEnabled
         );
     }
 
@@ -225,7 +310,10 @@ public record PlayerState(
             newWarmupLevel, newCooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
             obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
             newNavigationEnabled, newFlightEnabled, bossBarEnabled, newVisitorsEnabled,
-            lastBaseSet, lastBaseTeleport, visitorCooldownUntil
+            lastBaseSet, lastBaseTeleport, visitorCooldownUntil,
+            borderEnabled && newBaseLevel >= 1 && base.isPresent(),
+            totalBlocksPlaced,
+            spawnableOverlayEnabled && newBaseLevel >= 1 && base.isPresent()
         );
     }
 
@@ -235,7 +323,41 @@ public record PlayerState(
             warmupLevel, cooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
             obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
             navigationEnabled, flightEnabled, bossBarEnabled, enabled,
-            lastBaseSet, lastBaseTeleport, visitorCooldownUntil
+            lastBaseSet, lastBaseTeleport, visitorCooldownUntil, borderEnabled,
+            totalBlocksPlaced, spawnableOverlayEnabled
+        );
+    }
+
+    public PlayerState withBorderEnabled(boolean enabled) {
+        return new PlayerState(
+            playerId, latestName, base, baseLevel, sizeLevel, flightLevel,
+            warmupLevel, cooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
+            obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
+            navigationEnabled, flightEnabled, bossBarEnabled, visitorsEnabled,
+            lastBaseSet, lastBaseTeleport, visitorCooldownUntil, enabled,
+            totalBlocksPlaced, spawnableOverlayEnabled
+        );
+    }
+
+    public PlayerState withTotalBlocksPlaced(long count) {
+        return new PlayerState(
+            playerId, latestName, base, baseLevel, sizeLevel, flightLevel,
+            warmupLevel, cooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
+            obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
+            navigationEnabled, flightEnabled, bossBarEnabled, visitorsEnabled,
+            lastBaseSet, lastBaseTeleport, visitorCooldownUntil, borderEnabled,
+            count, spawnableOverlayEnabled
+        );
+    }
+
+    public PlayerState withSpawnableOverlayEnabled(boolean enabled) {
+        return new PlayerState(
+            playerId, latestName, base, baseLevel, sizeLevel, flightLevel,
+            warmupLevel, cooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
+            obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
+            navigationEnabled, flightEnabled, bossBarEnabled, visitorsEnabled,
+            lastBaseSet, lastBaseTeleport, visitorCooldownUntil, borderEnabled,
+            totalBlocksPlaced, enabled
         );
     }
 
@@ -247,7 +369,8 @@ public record PlayerState(
             warmupLevel, cooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
             obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
             navigationEnabled, flightEnabled, bossBarEnabled, visitorsEnabled,
-            lastBaseSet, lastBaseTeleport, cooldowns
+            lastBaseSet, lastBaseTeleport, cooldowns, borderEnabled,
+            totalBlocksPlaced, spawnableOverlayEnabled
         );
     }
 
@@ -257,7 +380,8 @@ public record PlayerState(
             warmupLevel, cooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
             obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
             navigationEnabled, flightEnabled, bossBarEnabled, visitorsEnabled,
-            lastBaseSet, Optional.empty(), visitorCooldownUntil
+            lastBaseSet, Optional.empty(), visitorCooldownUntil, borderEnabled,
+            totalBlocksPlaced, spawnableOverlayEnabled
         );
     }
 
@@ -267,7 +391,8 @@ public record PlayerState(
             warmupLevel, cooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
             obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
             navigationEnabled, flightEnabled, bossBarEnabled, visitorsEnabled,
-            lastBaseSet, lastBaseTeleport, Map.of()
+            lastBaseSet, lastBaseTeleport, Map.of(), borderEnabled,
+            totalBlocksPlaced, spawnableOverlayEnabled
         );
     }
 
@@ -277,7 +402,8 @@ public record PlayerState(
             warmupLevel, cooldownLevel, grassAndDirtBroken, stoneBroken, deepslateBroken,
             obsidianBroken, blocksPlacedInBase, blocksBrokenInBase,
             navigationEnabled, flightEnabled, bossBarEnabled, visitorsEnabled,
-            Optional.of(setAt), lastBaseTeleport, visitorCooldownUntil
+            Optional.of(setAt), lastBaseTeleport, visitorCooldownUntil, borderEnabled,
+            totalBlocksPlaced, spawnableOverlayEnabled
         );
     }
 

src/main/java/games/dmg/spigotbase/PluginSettings.java

@@ -21,6 +21,7 @@ public record PluginSettings(
     int flightWarningBuffer,
     int secondFlightVerticalRange,
     int teleportUnlockPlacements,
+    int spawnableOverlayUnlockPlacements,
     int secondWarmupPlacements,
     int thirdWarmupPlacements,
     int instantWarmupPlacements,
@@ -62,6 +63,7 @@ public record PluginSettings(
     private static final int DEFAULT_FLIGHT_WARNING_BUFFER = 5;
     private static final int DEFAULT_SECOND_FLIGHT_VERTICAL_RANGE = 100;
     private static final int DEFAULT_TELEPORT_UNLOCK_PLACEMENTS = 200;
+    private static final int DEFAULT_SPAWNABLE_OVERLAY_UNLOCK_PLACEMENTS = 250;
     private static final int DEFAULT_SECOND_WARMUP_PLACEMENTS = 1_000;
     private static final int DEFAULT_THIRD_WARMUP_PLACEMENTS = 2_000;
     private static final int DEFAULT_INSTANT_WARMUP_PLACEMENTS = 12_000;
@@ -110,6 +112,7 @@ public record PluginSettings(
             throw new IllegalArgumentException("second-flight-vertical-range must exceed the initial range");
         }
         requirePositive(teleportUnlockPlacements, "teleport-unlock-placements");
+        requirePositive(spawnableOverlayUnlockPlacements, "spawnable-overlay-unlock-placements");
         if (secondWarmupPlacements <= teleportUnlockPlacements
                 || thirdWarmupPlacements <= secondWarmupPlacements
                 || instantWarmupPlacements <= thirdWarmupPlacements) {
@@ -175,6 +178,11 @@ public record PluginSettings(
             integer(values, "flight-warning-buffer", DEFAULT_FLIGHT_WARNING_BUFFER),
             integer(values, "second-flight-vertical-range", DEFAULT_SECOND_FLIGHT_VERTICAL_RANGE),
             integer(values, "teleport-unlock-placements", DEFAULT_TELEPORT_UNLOCK_PLACEMENTS),
+            integer(
+                values,
+                "spawnable-overlay-unlock-placements",
+                DEFAULT_SPAWNABLE_OVERLAY_UNLOCK_PLACEMENTS
+            ),
             integer(values, "second-warmup-placements", DEFAULT_SECOND_WARMUP_PLACEMENTS),
             integer(values, "third-warmup-placements", DEFAULT_THIRD_WARMUP_PLACEMENTS),
             integer(values, "instant-warmup-placements", DEFAULT_INSTANT_WARMUP_PLACEMENTS),

src/main/java/games/dmg/spigotbase/ProgressCounter.java

@@ -6,5 +6,6 @@ public enum ProgressCounter {
     DEEPSLATE,
     OBSIDIAN,
     PLACEMENTS,
+    TOTAL_PLACEMENTS,
     BASE_BREAKS
 }

src/main/java/games/dmg/spigotbase/SpawnableBlockPolicy.java

@@ -0,0 +1,38 @@
+package games.dmg.spigotbase;
+
+import org.bukkit.block.Block;
+import org.bukkit.block.BlockFace;
+import org.bukkit.block.data.Bisected;
+import org.bukkit.block.data.type.Slab;
+import org.bukkit.block.data.type.Stairs;
+
+final class SpawnableBlockPolicy {
+    private SpawnableBlockPolicy() {
+    }
+
+    static boolean isCandidate(Block surface) {
+        if (!hasSpawnableTop(surface)) {
+            return false;
+        }
+        Block above = surface.getRelative(BlockFace.UP);
+        Block secondAbove = above.getRelative(BlockFace.UP);
+        return isEmpty(above)
+            && isEmpty(secondAbove)
+            && above.getLightFromBlocks() == 0
+            && above.getLightFromSky() <= 7;
+    }
+
+    private static boolean hasSpawnableTop(Block block) {
+        if (block.getBlockData() instanceof Slab slab) {
+            return slab.getType() == Slab.Type.TOP || slab.getType() == Slab.Type.DOUBLE;
+        }
+        if (block.getBlockData() instanceof Stairs stairs) {
+            return stairs.getHalf() == Bisected.Half.TOP;
+        }
+        return block.getType().isOccluding();
+    }
+
+    private static boolean isEmpty(Block block) {
+        return block.isPassable() && !block.isLiquid();
+    }
+}

src/main/java/games/dmg/spigotbase/SpawnableOverlayController.java

@@ -0,0 +1,185 @@
+package games.dmg.spigotbase;
+
+import java.util.ArrayDeque;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+import org.bukkit.Color;
+import org.bukkit.Location;
+import org.bukkit.Particle;
+import org.bukkit.Server;
+import org.bukkit.World;
+import org.bukkit.block.Block;
+import org.bukkit.entity.Player;
+
+final class SpawnableOverlayController implements Runnable {
+    static final int HORIZONTAL_RADIUS = 16;
+    static final int VERTICAL_RADIUS = 8;
+    static final int WORK_BUDGET = 2_048;
+    static final int PARTICLE_BUDGET = 128;
+    private static final int PENDING_BUDGET = PARTICLE_BUDGET * 4;
+    private static final int WIDTH = HORIZONTAL_RADIUS * 2 + 1;
+    private static final int HEIGHT = VERTICAL_RADIUS * 2 + 1;
+    private static final int TOTAL_POSITIONS = WIDTH * WIDTH * HEIGHT;
+    private static final Particle.DustOptions RED_DUST =
+        new Particle.DustOptions(Color.RED, 1.0F);
+
+    private final Server server;
+    private final BaseStateManager stateManager;
+    private final BaseBoundsService boundsService;
+    private final PluginSettingsProvider settings;
+    private final Map<UUID, ScanState> scans = new HashMap<>();
+
+    SpawnableOverlayController(
+        Server server,
+        BaseStateManager stateManager,
+        BaseBoundsService boundsService,
+        PluginSettingsProvider settings
+    ) {
+        this.server = server;
+        this.stateManager = stateManager;
+        this.boundsService = boundsService;
+        this.settings = settings;
+    }
+
+    @Override
+    public void run() {
+        Set<UUID> active = new HashSet<>();
+        for (Player player : server.getOnlinePlayers()) {
+            PlayerState playerState = stateManager.player(
+                player.getUniqueId(), player.getName()
+            );
+            if (!eligible(player, playerState)) {
+                scans.remove(player.getUniqueId());
+                continue;
+            }
+            active.add(player.getUniqueId());
+            updateAndRender(player, playerState);
+        }
+        scans.keySet().removeIf(playerId -> !active.contains(playerId));
+    }
+
+    private boolean eligible(Player player, PlayerState state) {
+        return state.spawnableOverlayEnabled()
+            && state.totalBlocksPlaced() >= settings.current()
+                .spawnableOverlayUnlockPlacements()
+            && state.base().isPresent()
+            && player.getWorld().getUID().equals(state.base().orElseThrow().worldId());
+    }
+
+    private void updateAndRender(Player player, PlayerState state) {
+        Location location = player.getLocation();
+        BaseLocation base = state.base().orElseThrow();
+        int centerX = location.getBlockX();
+        int centerY = location.getBlockY() - 1;
+        int centerZ = location.getBlockZ();
+        ScanOrigin origin = new ScanOrigin(
+            player.getWorld().getUID(), centerX, centerY, centerZ,
+            base.x(), base.y(), base.z(), boundsService.radius(state)
+        );
+        ScanState scan = scans.get(player.getUniqueId());
+        if (scan == null || !scan.origin.near(origin)) {
+            scan = new ScanState(origin);
+            scans.put(player.getUniqueId(), scan);
+        }
+        scan(player.getWorld(), boundsService.area(state), scan);
+        render(player, scan);
+    }
+
+    private static void scan(World world, BaseArea base, ScanState scan) {
+        int work = Math.min(WORK_BUDGET, TOTAL_POSITIONS);
+        int minimumWorldY = world.getMinHeight();
+        int maximumWorldY = world.getMaxHeight();
+        UUID worldId = world.getUID();
+        for (int offset = 0; offset < work; offset++) {
+            int index = (scan.cursor + offset) % TOTAL_POSITIONS;
+            int verticalIndex = index % HEIGHT;
+            int horizontalIndex = index / HEIGHT;
+            int zIndex = horizontalIndex % WIDTH;
+            int xIndex = horizontalIndex / WIDTH;
+            int x = scan.origin.centerX + xIndex - HORIZONTAL_RADIUS;
+            int y = scan.origin.centerY + verticalIndex - VERTICAL_RADIUS;
+            int z = scan.origin.centerZ + zIndex - HORIZONTAL_RADIUS;
+            BlockPosition position = new BlockPosition(x, y, z);
+            scan.spawnable.remove(position);
+            int deltaX = x - scan.origin.centerX;
+            int deltaZ = z - scan.origin.centerZ;
+            if (deltaX * deltaX + deltaZ * deltaZ
+                    > HORIZONTAL_RADIUS * HORIZONTAL_RADIUS
+                    || y < minimumWorldY
+                    || y >= maximumWorldY
+                    || !base.contains(worldId, x, y, z)) {
+                continue;
+            }
+            Block surface = world.getBlockAt(x, y, z);
+            if (SpawnableBlockPolicy.isCandidate(surface)) {
+                scan.spawnable.add(position);
+                if (scan.pending.size() < PENDING_BUDGET) {
+                    scan.pending.addLast(position);
+                }
+            }
+        }
+        scan.cursor = (scan.cursor + work) % TOTAL_POSITIONS;
+    }
+
+    private static void render(Player player, ScanState scan) {
+        for (int attempted = 0; attempted < PARTICLE_BUDGET; attempted++) {
+            BlockPosition position = scan.pending.pollFirst();
+            if (position == null) {
+                return;
+            }
+            if (!scan.spawnable.contains(position)) {
+                continue;
+            }
+            player.spawnParticle(
+                Particle.DUST,
+                new Location(
+                    player.getWorld(),
+                    position.x + 0.5,
+                    position.y + 1.05,
+                    position.z + 0.5
+                ),
+                1,
+                RED_DUST
+            );
+        }
+    }
+
+    private record BlockPosition(int x, int y, int z) {
+    }
+
+    private record ScanOrigin(
+        UUID worldId,
+        int centerX,
+        int centerY,
+        int centerZ,
+        int baseX,
+        int baseY,
+        int baseZ,
+        int baseRadius
+    ) {
+        boolean near(ScanOrigin other) {
+            return worldId.equals(other.worldId)
+                && Math.abs(centerX - other.centerX) <= 4
+                && Math.abs(centerY - other.centerY) <= 4
+                && Math.abs(centerZ - other.centerZ) <= 4
+                && baseX == other.baseX
+                && baseY == other.baseY
+                && baseZ == other.baseZ
+                && baseRadius == other.baseRadius;
+        }
+    }
+
+    private static final class ScanState {
+        private final ScanOrigin origin;
+        private final Set<BlockPosition> spawnable = new HashSet<>();
+        private final ArrayDeque<BlockPosition> pending = new ArrayDeque<>();
+        private int cursor;
+
+        private ScanState(ScanOrigin origin) {
+            this.origin = origin;
+        }
+    }
+}

src/main/java/games/dmg/spigotbase/SpawnableOverlayProgressionService.java

@@ -0,0 +1,19 @@
+package games.dmg.spigotbase;
+
+final class SpawnableOverlayProgressionService {
+    private final PluginSettingsProvider settings;
+
+    SpawnableOverlayProgressionService(PluginSettingsProvider settings) {
+        this.settings = settings;
+    }
+
+    SpawnableOverlayProgressionUpdate recordPlacement(PlayerState player) {
+        long previous = player.totalBlocksPlaced();
+        long updated = previous == Long.MAX_VALUE ? Long.MAX_VALUE : previous + 1;
+        int threshold = settings.current().spawnableOverlayUnlockPlacements();
+        return new SpawnableOverlayProgressionUpdate(
+            player.withTotalBlocksPlaced(updated),
+            previous < threshold && updated >= threshold
+        );
+    }
+}

src/main/java/games/dmg/spigotbase/SpawnableOverlayProgressionUpdate.java

@@ -0,0 +1,9 @@
+package games.dmg.spigotbase;
+
+record SpawnableOverlayProgressionUpdate(PlayerState player, boolean unlocked) {
+    SpawnableOverlayProgressionUpdate {
+        if (player == null) {
+            throw new IllegalArgumentException("player is required");
+        }
+    }
+}

src/main/java/games/dmg/spigotbase/SpigotBasePlugin.java

@@ -46,6 +46,7 @@ public final class SpigotBasePlugin extends JavaPlugin {
             progressionService,
             secondaryProgressionService,
             teleportProgressionService,
+            new SpawnableOverlayProgressionService(settingsProvider),
             boundsService,
             settingsProvider
         );
@@ -65,28 +66,25 @@ public final class SpigotBasePlugin extends JavaPlugin {
         getServer().getPluginManager().registerEvents(teleportManager, this);
 
         command("setbase").setExecutor(new SetBaseCommand(stateManager, baseService, Clock.systemUTC()));
-        command("base").setExecutor(
-            new BaseCommand(teleportManager, stateManager, visitorPolicy, settingsProvider)
+        command("base").setExecutor(new BaseCommand(teleportManager));
+        BaseSettingsCommand settingsCommand = new BaseSettingsCommand(
+            stateManager,
+            settingsProvider,
+            flightController
         );
-        command("baseprogress").setExecutor(
-            new BaseProgressCommand(stateManager, settingsProvider)
-        );
-        BaseNavigationCommand navigationCommand = new BaseNavigationCommand(stateManager);
-        command("basenavigation").setExecutor(navigationCommand);
-        command("basenavigation").setTabCompleter(navigationCommand);
-        command("baseflight").setExecutor(new BaseFlightCommand(stateManager, flightController));
-        command("basevisitors").setExecutor(new BaseVisitorsCommand(stateManager));
+        command("basesettings").setExecutor(settingsCommand);
+        command("basesettings").setTabCompleter(settingsCommand);
         GoToBaseCommand goToBaseCommand = new GoToBaseCommand(stateManager, teleportManager);
         command("gotobase").setExecutor(goToBaseCommand);
         command("gotobase").setTabCompleter(goToBaseCommand);
-        command("baseadmin").setExecutor(
-            new BaseAdminCommand(
-                this,
-                stateManager,
-                new AdminProgressionService(settingsProvider),
-                settingsProvider
-            )
+        BaseAdminCommand adminCommand = new BaseAdminCommand(
+            this,
+            stateManager,
+            new AdminProgressionService(settingsProvider),
+            settingsProvider
         );
+        command("baseadmin").setExecutor(adminCommand);
+        command("baseadmin").setTabCompleter(adminCommand);
 
         getServer().getScheduler().runTaskTimer(
             this,
@@ -94,6 +92,20 @@ public final class SpigotBasePlugin extends JavaPlugin {
             10L,
             10L
         );
+        getServer().getScheduler().runTaskTimer(
+            this,
+            new BaseBorderController(getServer(), stateManager, boundsService),
+            10L,
+            10L
+        );
+        getServer().getScheduler().runTaskTimer(
+            this,
+            new SpawnableOverlayController(
+                getServer(), stateManager, boundsService, settingsProvider
+            ),
+            10L,
+            10L
+        );
         getServer().getScheduler().runTaskTimer(this, flightController, 5L, 5L);
         getServer().getScheduler().runTaskTimer(this, stateManager::saveIfDirty, 600L, 600L);
         getLogger().info("Spigot Base enabled.");

src/main/java/games/dmg/spigotbase/YamlBaseStateRepository.java

@@ -127,7 +127,10 @@ public final class YamlBaseStateRepository {
                     yaml.getBoolean(path + ".visitors-enabled", false),
                     instant(yaml, path + ".last-base-set-epoch-millis"),
                     instant(yaml, path + ".last-base-teleport-epoch-millis"),
-                    loadVisitorCooldowns(yaml, path + ".visitor-cooldowns")
+                    loadVisitorCooldowns(yaml, path + ".visitor-cooldowns"),
+                    yaml.getBoolean(path + ".border-enabled", false),
+                    totalPlacementCount(yaml, path),
+                    yaml.getBoolean(path + ".spawnable-overlay-enabled", false)
                 );
                 players.put(playerId, player);
             } catch (IllegalArgumentException ignored) {
@@ -194,6 +197,13 @@ public final class YamlBaseStateRepository {
         return yaml.getLong(path);
     }
 
+    private static long totalPlacementCount(YamlConfiguration yaml, String playerPath) {
+        return Math.max(
+            count(yaml, playerPath + ".total-blocks-placed"),
+            count(yaml, playerPath + ".blocks-placed-in-base")
+        );
+    }
+
     private static Optional<Instant> instant(YamlConfiguration yaml, String path) {
         if (!yaml.isLong(path) && !yaml.isInt(path)) {
             return Optional.empty();
@@ -222,6 +232,9 @@ public final class YamlBaseStateRepository {
             yaml.set(path + ".flight-enabled", player.flightEnabled());
             yaml.set(path + ".boss-bar-enabled", player.bossBarEnabled());
             yaml.set(path + ".visitors-enabled", player.visitorsEnabled());
+            yaml.set(path + ".border-enabled", player.borderEnabled());
+            yaml.set(path + ".total-blocks-placed", player.totalBlocksPlaced());
+            yaml.set(path + ".spawnable-overlay-enabled", player.spawnableOverlayEnabled());
             yaml.set(
                 path + ".last-base-set-epoch-millis",
                 player.lastBaseSet().map(Instant::toEpochMilli).orElse(null)

src/main/resources/config.yml

@@ -46,6 +46,9 @@ fourth-teleport-cooldown-seconds: 1800
 visitor-unlock-diamond-cost: 128
 visitor-currency-material: DIAMOND
 
+# Spawnable block overlay
+spawnable-overlay-unlock-placements: 250
+
 # Progress and notification presentation
 cooldown-excluded-materials: []
 boss-bar-duration-ticks: 60

src/main/resources/plugin.yml

@@ -8,27 +8,23 @@ commands:
   setbase:
     description: Set your unlocked personal base.
     usage: /setbase
+    aliases: [sethome]
   base:
-    description: Teleport to or upgrade your base.
-    usage: /base [upgrade]
-  basenavigation:
-    description: Toggle particle navigation toward your base.
-    usage: /basenavigation [on|off]
-  baseflight:
-    description: Toggle flight within your base.
-    usage: /baseflight
-  basevisitors:
-    description: Toggle visitor access to your base.
-    usage: /basevisitors
+    description: Teleport to your base.
+    usage: /base
+    aliases: [home]
   gotobase:
     description: Visit an available player base.
     usage: /gotobase <player>
-  baseprogress:
-    description: View progression or toggle progress boss bars.
-    usage: /baseprogress [bossbar]
+    aliases: [visit]
+  basesettings:
+    description: View progression, upgrade, and manage base settings.
+    usage: /basesettings [status|upgrade|visitors|navigation|flight|border|spawnable|bossbar]
+    aliases: [homesettings]
   baseadmin:
     description: Administer Spigot Base.
     usage: /baseadmin <subcommand>
+    aliases: [homeadmin]
     permission: spigotbase.admin
 permissions:
   spigotbase.admin:

src/test/java/games/dmg/spigotbase/AdminProgressCounterTest.java

@@ -11,6 +11,19 @@ final class AdminProgressCounterTest {
         new PluginSettingsProvider(PluginSettings.from(Map.of()))
     );
 
+    @Test
+    void settingTotalPlacementCounterUnlocksSpawnableOverlay() {
+        PlayerState player = PlayerState.newPlayer(UUID.randomUUID(), "Alex");
+
+        PlayerState updated = service.setProgress(
+            player,
+            ProgressCounter.TOTAL_PLACEMENTS,
+            250
+        );
+
+        assertEquals(250, updated.totalBlocksPlaced());
+    }
+
     @Test
     void settingPlacementCounterEvaluatesBaseAndWarmupTiers() {
         PlayerState player = PlayerState.newPlayer(UUID.randomUUID(), "Alex");

src/test/java/games/dmg/spigotbase/AdminProgressionServiceTest.java

@@ -4,6 +4,7 @@ import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 
+import java.time.Instant;
 import java.util.UUID;
 import org.junit.jupiter.api.Test;
 
@@ -36,6 +37,40 @@ final class AdminProgressionServiceTest {
         assertFalse(updated.visitorsEnabled());
     }
 
+    @Test
+    void loweringBaseDisablesBorderVisualization() {
+        UUID playerId = UUID.randomUUID();
+        PlayerState player = PlayerState.newPlayer(playerId, "Alex")
+            .withAdministrativeLevels(1, 0, 0, 0, 0, false, false, false)
+            .withBase(
+                new BaseLocation(UUID.randomUUID(), "world", 0, 64, 0, 0, 0),
+                Instant.EPOCH
+            )
+            .withBorderEnabled(true);
+
+        PlayerState updated = service.setLevel(player, ProgressionPath.BASE, 0);
+
+        assertFalse(updated.borderEnabled());
+    }
+
+    @Test
+    void completeResetClearsSpawnableOverlayProgressAndPreference() {
+        UUID playerId = UUID.randomUUID();
+        PlayerState player = PlayerState.newPlayer(playerId, "Alex")
+            .withAdministrativeLevels(1, 0, 0, 0, 0, false, false, false)
+            .withBase(
+                new BaseLocation(UUID.randomUUID(), "world", 0, 64, 0, 0, 0),
+                Instant.EPOCH
+            )
+            .withTotalBlocksPlaced(250)
+            .withSpawnableOverlayEnabled(true);
+
+        PlayerState updated = service.resetPath(player, ProgressionPath.BASE);
+
+        assertEquals(0, updated.totalBlocksPlaced());
+        assertFalse(updated.spawnableOverlayEnabled());
+    }
+
     @Test
     void rejectsUnknownLevel() {
         PlayerState player = PlayerState.newPlayer(UUID.randomUUID(), "Alex");

src/test/java/games/dmg/spigotbase/BaseAdminCommandTest.java

@@ -0,0 +1,323 @@
+package games.dmg.spigotbase;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.mockStatic;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import java.time.Instant;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.UUID;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.UnaryOperator;
+import org.bukkit.Bukkit;
+import org.bukkit.ChatColor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.configuration.file.FileConfiguration;
+import org.bukkit.plugin.java.JavaPlugin;
+import org.junit.jupiter.api.Test;
+import org.mockito.MockedStatic;
+
+final class BaseAdminCommandTest {
+    @Test
+    void adminCanEnableUnlockedSpawnableOverlayForPlayer() {
+        CommandSender sender = mock(CommandSender.class);
+        when(sender.hasPermission("spigotbase.admin")).thenReturn(true);
+        UUID playerId = UUID.randomUUID();
+        PlayerState target = PlayerState.newPlayer(playerId, "Builder")
+            .withAdministrativeLevels(1, 0, 0, 0, 0, false, false, false)
+            .withBase(
+                new BaseLocation(UUID.randomUUID(), "world", 0, 64, 0, 0, 0),
+                Instant.EPOCH
+            )
+            .withTotalBlocksPlaced(250);
+        AtomicReference<PlayerState> updated = new AtomicReference<>();
+        BaseStateManager stateManager = mock(BaseStateManager.class);
+        when(stateManager.findByName("Builder")).thenReturn(Optional.of(target));
+        when(stateManager.update(any(), anyString(), any())).thenAnswer(invocation -> {
+            @SuppressWarnings("unchecked")
+            UnaryOperator<PlayerState> operation = invocation.getArgument(2);
+            PlayerState result = operation.apply(target);
+            updated.set(result);
+            return result;
+        });
+        BaseAdminCommand command = new BaseAdminCommand(
+            mock(JavaPlugin.class),
+            stateManager,
+            new AdminProgressionService(
+                new PluginSettingsProvider(PluginSettings.from(Map.of()))
+            ),
+            new PluginSettingsProvider(PluginSettings.from(Map.of()))
+        );
+
+        try (MockedStatic<Bukkit> bukkit = mockStatic(Bukkit.class)) {
+            bukkit.when(() -> Bukkit.getPlayerExact("Builder")).thenReturn(null);
+            command.onCommand(sender, null, "baseadmin",
+                new String[] {"setsetting", "Builder", "spawnable", "enable"});
+        }
+
+        assertTrue(updated.get().spawnableOverlayEnabled());
+    }
+
+    @Test
+    void invalidPathShowsFriendlyUsage() {
+        CommandSender sender = mock(CommandSender.class);
+        when(sender.hasPermission("spigotbase.admin")).thenReturn(true);
+        PlayerState target = PlayerState.newPlayer(UUID.randomUUID(), "Builder");
+        BaseStateManager stateManager = mock(BaseStateManager.class);
+        when(stateManager.findByName("Builder")).thenReturn(Optional.of(target));
+        BaseAdminCommand command = new BaseAdminCommand(
+            mock(JavaPlugin.class),
+            stateManager,
+            mock(AdminProgressionService.class),
+            new PluginSettingsProvider(PluginSettings.from(Map.of()))
+        );
+
+        try (MockedStatic<Bukkit> bukkit = mockStatic(Bukkit.class)) {
+            bukkit.when(() -> Bukkit.getPlayerExact("Builder")).thenReturn(null);
+            command.onCommand(sender, null, "baseadmin",
+                new String[] {"setlevel", "Builder", "unknown", "1"});
+        }
+
+        verify(sender).sendMessage(ChatColor.RED
+            + "Usage: /baseadmin setlevel <player> <base|size|flight|warmup|cooldown> <level>");
+        verify(stateManager, never()).update(any(), anyString(), any());
+    }
+
+    @Test
+    void autocompletesValidLevelsAndResetConfirmation() {
+        CommandSender sender = mock(CommandSender.class);
+        when(sender.hasPermission("spigotbase.admin")).thenReturn(true);
+        BaseAdminCommand command = new BaseAdminCommand(
+            mock(JavaPlugin.class),
+            mock(BaseStateManager.class),
+            mock(AdminProgressionService.class),
+            new PluginSettingsProvider(PluginSettings.from(Map.of()))
+        );
+
+        assertEquals(
+            List.of("0", "1", "2", "3", "4"),
+            command.onTabComplete(sender, null, "baseadmin",
+                new String[] {"setlevel", "Builder", "base", ""})
+        );
+        assertEquals(
+            List.of("0", "1", "2", "3"),
+            command.onTabComplete(sender, null, "baseadmin",
+                new String[] {"setlevel", "Builder", "flight", ""})
+        );
+        assertEquals(
+            List.of("confirm"),
+            command.onTabComplete(sender, null, "baseadmin",
+                new String[] {"reset", "Builder", "all", ""})
+        );
+    }
+
+    @Test
+    void autocompletesCommandSpecificOptions() {
+        CommandSender sender = mock(CommandSender.class);
+        when(sender.hasPermission("spigotbase.admin")).thenReturn(true);
+        BaseAdminCommand command = new BaseAdminCommand(
+            mock(JavaPlugin.class),
+            mock(BaseStateManager.class),
+            mock(AdminProgressionService.class),
+            new PluginSettingsProvider(PluginSettings.from(Map.of()))
+        );
+
+        assertEquals(
+            List.of("base", "size", "flight", "warmup", "cooldown"),
+            command.onTabComplete(sender, null, "baseadmin",
+                new String[] {"setlevel", "Builder", ""})
+        );
+        assertEquals(
+            List.of(
+                "grass_dirt", "stone", "deepslate", "obsidian", "placements",
+                "total_placements", "base_breaks"
+            ),
+            command.onTabComplete(sender, null, "baseadmin",
+                new String[] {"setprogress", "Builder", ""})
+        );
+        assertEquals(
+            List.of("spawnable"),
+            command.onTabComplete(sender, null, "baseadmin",
+                new String[] {"setsetting", "Builder", ""})
+        );
+        assertEquals(
+            List.of("enable"),
+            command.onTabComplete(sender, null, "baseadmin",
+                new String[] {"setsetting", "Builder", "spawnable", "e"})
+        );
+        assertEquals(
+            List.of("personal", "visitor", "all"),
+            command.onTabComplete(sender, null, "baseadmin",
+                new String[] {"clearcooldown", "Builder", ""})
+        );
+        assertEquals(
+            List.of("size", "flight", "warmup", "cooldown", "all"),
+            command.onTabComplete(sender, null, "baseadmin",
+                new String[] {"reset", "Builder", ""})
+        );
+    }
+
+    @Test
+    void adminCanChangeSpawnableOverlayUnlockThreshold() {
+        CommandSender sender = mock(CommandSender.class);
+        when(sender.hasPermission("spigotbase.admin")).thenReturn(true);
+        JavaPlugin plugin = mock(JavaPlugin.class);
+        FileConfiguration configuration = mock(FileConfiguration.class);
+        when(plugin.getConfig()).thenReturn(configuration);
+        when(configuration.get("spawnable-overlay-unlock-placements")).thenReturn(250);
+        when(configuration.getValues(false)).thenReturn(Map.of(
+            "spawnable-overlay-unlock-placements", 250
+        ));
+        PluginSettingsProvider settings = new PluginSettingsProvider(
+            PluginSettings.from(Map.of())
+        );
+        BaseAdminCommand command = new BaseAdminCommand(
+            plugin,
+            mock(BaseStateManager.class),
+            mock(AdminProgressionService.class),
+            settings
+        );
+
+        try (MockedStatic<PluginSettingsValidator> validator =
+                mockStatic(PluginSettingsValidator.class)) {
+            validator.when(() -> PluginSettingsValidator.validateMaterials(
+                any(PluginSettings.class)
+            )).thenAnswer(invocation -> invocation.getArgument(0));
+            command.onCommand(sender, null, "baseadmin", new String[] {
+                "config", "spawnable-overlay-unlock-placements", "500"
+            });
+        }
+
+        verify(configuration).set("spawnable-overlay-unlock-placements", 500L);
+        verify(plugin).saveConfig();
+        assertEquals(500, settings.current().spawnableOverlayUnlockPlacements());
+    }
+
+    @Test
+    void autocompletesNumericConfigurationKeys() {
+        CommandSender sender = mock(CommandSender.class);
+        when(sender.hasPermission("spigotbase.admin")).thenReturn(true);
+        JavaPlugin plugin = mock(JavaPlugin.class);
+        FileConfiguration configuration = mock(FileConfiguration.class);
+        when(plugin.getConfig()).thenReturn(configuration);
+        when(configuration.getValues(false)).thenReturn(Map.of(
+            "base-unlock-blocks", 250,
+            "visitor-currency-material", "DIAMOND",
+            "title-stay-ticks", 70
+        ));
+        BaseAdminCommand command = new BaseAdminCommand(
+            plugin,
+            mock(BaseStateManager.class),
+            mock(AdminProgressionService.class),
+            new PluginSettingsProvider(PluginSettings.from(Map.of()))
+        );
+
+        assertEquals(
+            List.of("base-unlock-blocks"),
+            command.onTabComplete(sender, null, "baseadmin", new String[] {"config", "base"})
+        );
+    }
+
+    @Test
+    void autocompletesKnownOfflinePlayers() {
+        CommandSender sender = mock(CommandSender.class);
+        when(sender.hasPermission("spigotbase.admin")).thenReturn(true);
+        BaseStateManager stateManager = mock(BaseStateManager.class);
+        PlayerState alex = PlayerState.newPlayer(UUID.randomUUID(), "Alex");
+        PlayerState blake = PlayerState.newPlayer(UUID.randomUUID(), "Blake");
+        when(stateManager.knownPlayers()).thenReturn(Map.of(
+            alex.playerId(), alex,
+            blake.playerId(), blake
+        ));
+        BaseAdminCommand command = new BaseAdminCommand(
+            mock(JavaPlugin.class),
+            stateManager,
+            mock(AdminProgressionService.class),
+            new PluginSettingsProvider(PluginSettings.from(Map.of()))
+        );
+
+        assertEquals(
+            List.of("Alex", "Blake"),
+            command.onTabComplete(sender, null, "baseadmin", new String[] {"status", ""})
+        );
+    }
+
+    @Test
+    void autocompletesAdminSubcommandsForPermittedSenders() {
+        CommandSender sender = mock(CommandSender.class);
+        when(sender.hasPermission("spigotbase.admin")).thenReturn(true);
+        BaseAdminCommand command = new BaseAdminCommand(
+            mock(JavaPlugin.class),
+            mock(BaseStateManager.class),
+            mock(AdminProgressionService.class),
+            new PluginSettingsProvider(PluginSettings.from(Map.of()))
+        );
+
+        assertEquals(
+            List.of(
+                "status", "setlevel", "setprogress", "setsetting", "clearcooldown", "reset",
+                "config"
+            ),
+            command.onTabComplete(sender, null, "baseadmin", new String[] {""})
+        );
+    }
+
+    @Test
+    void resetBaseRequiresConfirmedCompleteReset() {
+        CommandSender sender = mock(CommandSender.class);
+        when(sender.hasPermission("spigotbase.admin")).thenReturn(true);
+        PlayerState target = PlayerState.newPlayer(UUID.randomUUID(), "Builder");
+        BaseStateManager stateManager = mock(BaseStateManager.class);
+        when(stateManager.findByName("Builder")).thenReturn(Optional.of(target));
+        BaseAdminCommand command = new BaseAdminCommand(
+            mock(JavaPlugin.class),
+            stateManager,
+            mock(AdminProgressionService.class),
+            new PluginSettingsProvider(PluginSettings.from(Map.of()))
+        );
+
+        try (MockedStatic<Bukkit> bukkit = mockStatic(Bukkit.class)) {
+            bukkit.when(() -> Bukkit.getPlayerExact("Builder")).thenReturn(null);
+            command.onCommand(
+                sender,
+                null,
+                "baseadmin",
+                new String[] {"reset", "Builder", "base"}
+            );
+        }
+
+        verify(stateManager, never()).update(any(), anyString(), any());
+        verify(sender).sendMessage(ChatColor.RED
+            + "Resetting base removes all progression. Use: /baseadmin reset Builder all confirm");
+    }
+
+    @Test
+    void statusDisplaysKnownPlayerProgress() {
+        CommandSender sender = mock(CommandSender.class);
+        when(sender.hasPermission("spigotbase.admin")).thenReturn(true);
+        PlayerState target = PlayerState.newPlayer(UUID.randomUUID(), "Builder");
+        BaseStateManager stateManager = mock(BaseStateManager.class);
+        when(stateManager.findByName("Builder")).thenReturn(Optional.of(target));
+        BaseAdminCommand command = new BaseAdminCommand(
+            mock(JavaPlugin.class),
+            stateManager,
+            mock(AdminProgressionService.class),
+            new PluginSettingsProvider(PluginSettings.from(Map.of()))
+        );
+
+        try (MockedStatic<Bukkit> bukkit = mockStatic(Bukkit.class)) {
+            bukkit.when(() -> Bukkit.getPlayerExact("Builder")).thenReturn(null);
+            command.onCommand(sender, null, "baseadmin", new String[] {"status", "Builder"});
+        }
+
+        verify(sender).sendMessage(ChatColor.GOLD + "=== Builder Base Progress ===");
+    }
+}

src/test/java/games/dmg/spigotbase/BaseBorderControllerTest.java

@@ -0,0 +1,92 @@
+package games.dmg.spigotbase;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.atLeastOnce;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import java.time.Instant;
+import java.util.Map;
+import java.util.UUID;
+import org.bukkit.Location;
+import org.bukkit.Particle;
+import org.bukkit.Server;
+import org.bukkit.World;
+import org.bukkit.entity.Player;
+import org.junit.jupiter.api.Test;
+
+final class BaseBorderControllerTest {
+    @Test
+    void doesNotRenderOutsideTheBaseVerticalRange() {
+        UUID playerId = UUID.randomUUID();
+        UUID worldId = UUID.randomUUID();
+        PlayerState state = PlayerState.newPlayer(playerId, "Builder")
+            .withAdministrativeLevels(1, 0, 0, 0, 0, false, false, false)
+            .withBase(new BaseLocation(worldId, "world", 0, 64, 0, 0, 0), Instant.EPOCH)
+            .withBorderEnabled(true);
+
+        World world = mock(World.class);
+        when(world.getUID()).thenReturn(worldId);
+        Player player = mock(Player.class);
+        when(player.getUniqueId()).thenReturn(playerId);
+        when(player.getName()).thenReturn("Builder");
+        when(player.getWorld()).thenReturn(world);
+        when(player.getLocation()).thenReturn(new Location(world, 10.5, 100.0, 0.5));
+        Server server = mock(Server.class);
+        doReturn(java.util.List.of(player)).when(server).getOnlinePlayers();
+        BaseStateManager stateManager = mock(BaseStateManager.class);
+        when(stateManager.player(playerId, "Builder")).thenReturn(state);
+
+        new BaseBorderController(
+            server,
+            stateManager,
+            new BaseBoundsService(PluginSettings.from(Map.of()))
+        ).run();
+
+        verify(player, never()).spawnParticle(
+            eq(Particle.END_ROD),
+            any(Location.class),
+            eq(1),
+            eq(0.0), eq(0.0), eq(0.0), eq(0.0)
+        );
+    }
+
+    @Test
+    void ownerSeesParticlesAtCurrentHeightNearEnabledBorder() {
+        UUID playerId = UUID.randomUUID();
+        UUID worldId = UUID.randomUUID();
+        PlayerState state = PlayerState.newPlayer(playerId, "Builder")
+            .withAdministrativeLevels(1, 0, 0, 0, 0, false, false, false)
+            .withBase(new BaseLocation(worldId, "world", 0, 64, 0, 0, 0), Instant.EPOCH)
+            .withBorderEnabled(true);
+
+        World world = mock(World.class);
+        when(world.getUID()).thenReturn(worldId);
+        Player player = mock(Player.class);
+        when(player.getUniqueId()).thenReturn(playerId);
+        when(player.getName()).thenReturn("Builder");
+        when(player.getWorld()).thenReturn(world);
+        when(player.getLocation()).thenReturn(new Location(world, 10.5, 70.0, 0.5));
+        Server server = mock(Server.class);
+        doReturn(java.util.List.of(player)).when(server).getOnlinePlayers();
+        BaseStateManager stateManager = mock(BaseStateManager.class);
+        when(stateManager.player(playerId, "Builder")).thenReturn(state);
+
+        new BaseBorderController(
+            server,
+            stateManager,
+            new BaseBoundsService(PluginSettings.from(Map.of()))
+        ).run();
+
+        verify(player, atLeastOnce()).spawnParticle(
+            eq(Particle.END_ROD),
+            any(Location.class),
+            eq(1),
+            eq(0.0), eq(0.0), eq(0.0), eq(0.0)
+        );
+    }
+}

src/test/java/games/dmg/spigotbase/BaseBorderGeometryTest.java

@@ -0,0 +1,27 @@
+package games.dmg.spigotbase;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.List;
+import org.junit.jupiter.api.Test;
+
+final class BaseBorderGeometryTest {
+    @Test
+    void producesBoundedPointsOnTheCurrentCircularBoundary() {
+        List<BaseBorderGeometry.Point> points = BaseBorderGeometry.visiblePoints(
+            0.5, 0.5, 150, 150.5, 0.5
+        );
+
+        assertFalse(points.isEmpty());
+        assertTrue(points.size() <= BaseBorderGeometry.MAX_PARTICLES);
+        assertTrue(points.stream().allMatch(point ->
+            Math.abs(Math.hypot(point.x() - 0.5, point.z() - 0.5) - 150.0) < 0.0001
+        ));
+    }
+
+    @Test
+    void omitsParticlesWhenPlayerIsFarFromBoundary() {
+        assertTrue(BaseBorderGeometry.visiblePoints(0.5, 0.5, 10, 100.5, 0.5).isEmpty());
+    }
+}

src/test/java/games/dmg/spigotbase/BaseFlightControllerTest.java

@@ -0,0 +1,93 @@
+package games.dmg.spigotbase;
+
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import java.time.Instant;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.bukkit.Location;
+import org.bukkit.Server;
+import org.bukkit.World;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.PlayerInventory;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+final class BaseFlightControllerTest {
+    private final UUID playerId = UUID.randomUUID();
+    private final UUID worldId = UUID.randomUUID();
+    private final Server server = mock(Server.class);
+    private final BaseStateManager stateManager = mock(BaseStateManager.class);
+    private final Player player = mock(Player.class);
+    private final PlayerState state = PlayerState.newPlayer(playerId, "Alex")
+        .withGrassAndDirtProgress(250, 1)
+        .withBase(new BaseLocation(worldId, "world", 0, 64, 0, 0, 0), Instant.EPOCH)
+        .withFlightLevel(1, true);
+    private final BaseFlightController controller = new BaseFlightController(
+        server,
+        stateManager,
+        new SecondaryProgressionService(PluginSettings.from(Map.of())),
+        new BaseBoundsService(PluginSettings.from(Map.of())),
+        new PluginSettingsProvider(PluginSettings.from(Map.of()))
+    );
+
+    @BeforeEach
+    void setUp() {
+        World world = mock(World.class);
+        Location location = mock(Location.class);
+        PlayerInventory inventory = mock(PlayerInventory.class);
+
+        doReturn(List.of(player)).when(server).getOnlinePlayers();
+        when(player.getUniqueId()).thenReturn(playerId);
+        when(player.getName()).thenReturn("Alex");
+        when(player.getGameMode()).thenReturn(org.bukkit.GameMode.SURVIVAL);
+        when(player.getInventory()).thenReturn(inventory);
+        when(inventory.getStorageContents()).thenReturn(new ItemStack[0]);
+        when(stateManager.player(playerId, "Alex")).thenReturn(state);
+        when(player.getWorld()).thenReturn(world);
+        when(world.getUID()).thenReturn(worldId);
+        when(player.getLocation()).thenReturn(location);
+        when(location.getX()).thenReturn(12.5);
+        when(location.getZ()).thenReturn(0.5);
+        when(location.getBlockY()).thenReturn(64);
+        when(player.getAllowFlight()).thenReturn(true);
+    }
+
+    @Test
+    void walkingInWarningBufferDoesNotShowLeavingBaseWarning() {
+        when(player.isFlying()).thenReturn(false);
+
+        controller.run();
+
+        verify(player, never()).sendTitle(anyString(), anyString(), anyInt(), anyInt(), anyInt());
+    }
+
+    @Test
+    void flyingInWarningBufferShowsLeavingBaseWarning() {
+        when(player.isFlying()).thenReturn(true);
+
+        controller.run();
+
+        verify(player).sendTitle(anyString(), anyString(), anyInt(), anyInt(), anyInt());
+    }
+
+    @Test
+    void warningCanAppearAgainAfterPlayerStopsAndResumesFlyingInBuffer() {
+        when(player.isFlying()).thenReturn(true, false, true);
+
+        controller.run();
+        controller.run();
+        controller.run();
+
+        verify(player, times(2)).sendTitle(anyString(), anyString(), anyInt(), anyInt(), anyInt());
+    }
+}

src/test/java/games/dmg/spigotbase/BaseNavigationControllerTest.java

@@ -0,0 +1,60 @@
+package games.dmg.spigotbase;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import java.time.Instant;
+import java.util.Map;
+import java.util.UUID;
+import org.bukkit.Location;
+import org.bukkit.Particle;
+import org.bukkit.Server;
+import org.bukkit.World;
+import org.bukkit.entity.Player;
+import org.junit.jupiter.api.Test;
+
+final class BaseNavigationControllerTest {
+    @Test
+    void showsParticlesOnlyMoreThanTwentyFiveBlocksBeyondBorder() {
+        UUID playerId = UUID.randomUUID();
+        UUID worldId = UUID.randomUUID();
+        PlayerState state = PlayerState.newPlayer(playerId, "Builder")
+            .withAdministrativeLevels(2, 0, 0, 0, 0, true, false, false)
+            .withBase(new BaseLocation(worldId, "world", 0, 64, 0, 0, 0), Instant.EPOCH);
+        World world = mock(World.class);
+        when(world.getUID()).thenReturn(worldId);
+        Player player = mock(Player.class);
+        when(player.getUniqueId()).thenReturn(playerId);
+        when(player.getName()).thenReturn("Builder");
+        when(player.getWorld()).thenReturn(world);
+        when(player.getLocation()).thenReturn(new Location(world, 35.5, 64.0, 0.5));
+        Server server = mock(Server.class);
+        doReturn(java.util.List.of(player)).when(server).getOnlinePlayers();
+        BaseStateManager stateManager = mock(BaseStateManager.class);
+        when(stateManager.player(playerId, "Builder")).thenReturn(state);
+        PluginSettingsProvider settings = new PluginSettingsProvider(
+            PluginSettings.from(Map.of())
+        );
+
+        new BaseNavigationController(server, stateManager, settings).run();
+
+        verify(player, never()).spawnParticle(
+            eq(Particle.END_ROD), any(Location.class), eq(1),
+            eq(0.0), eq(0.0), eq(0.0), eq(0.0)
+        );
+
+        when(player.getLocation()).thenReturn(new Location(world, 35.51, 64.0, 0.5));
+        new BaseNavigationController(server, stateManager, settings).run();
+
+        verify(player, times(settings.current().navigationParticleCount())).spawnParticle(
+            eq(Particle.END_ROD), any(Location.class), eq(1),
+            eq(0.0), eq(0.0), eq(0.0), eq(0.0)
+        );
+    }
+}

src/test/java/games/dmg/spigotbase/BaseNavigationVisibilityTest.java

@@ -0,0 +1,26 @@
+package games.dmg.spigotbase;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.UUID;
+import org.junit.jupiter.api.Test;
+
+final class BaseNavigationVisibilityTest {
+    private static final BaseLocation BASE = new BaseLocation(
+        UUID.randomUUID(), "world", 0, 64, 0, 0, 0
+    );
+
+    @Test
+    void hidesNavigationAtAndWithinTwentyFiveBlocksBeyondBorder() {
+        assertFalse(BaseNavigationVisibility.isBeyondBorderBuffer(BASE, 10, 35.5, 0.5));
+        assertFalse(BaseNavigationVisibility.isBeyondBorderBuffer(BASE, 10, 20.5, 0.5));
+    }
+
+    @Test
+    void showsNavigationMoreThanTwentyFiveBlocksBeyondCurrentBorder() {
+        assertTrue(BaseNavigationVisibility.isBeyondBorderBuffer(BASE, 10, 35.51, 0.5));
+        assertFalse(BaseNavigationVisibility.isBeyondBorderBuffer(BASE, 75, 100.5, 0.5));
+        assertTrue(BaseNavigationVisibility.isBeyondBorderBuffer(BASE, 75, 100.51, 0.5));
+    }
+}

src/test/java/games/dmg/spigotbase/BaseProgressListenerTest.java

@@ -0,0 +1,66 @@
+package games.dmg.spigotbase;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.UnaryOperator;
+import org.bukkit.GameMode;
+import org.bukkit.World;
+import org.bukkit.block.Block;
+import org.bukkit.entity.Player;
+import org.bukkit.event.block.BlockPlaceEvent;
+import org.bukkit.plugin.Plugin;
+import org.junit.jupiter.api.Test;
+
+final class BaseProgressListenerTest {
+    @Test
+    void survivalPlacementOutsideBaseCountsTowardOverlayUnlock() {
+        UUID playerId = UUID.randomUUID();
+        PlayerState current = PlayerState.newPlayer(playerId, "Builder");
+        AtomicReference<PlayerState> updated = new AtomicReference<>();
+        BaseStateManager stateManager = mock(BaseStateManager.class);
+        when(stateManager.player(playerId, "Builder")).thenReturn(current);
+        when(stateManager.update(any(), anyString(), any())).thenAnswer(invocation -> {
+            @SuppressWarnings("unchecked")
+            UnaryOperator<PlayerState> operation = invocation.getArgument(2);
+            PlayerState result = operation.apply(current);
+            updated.set(result);
+            return result;
+        });
+        Player player = mock(Player.class);
+        when(player.getUniqueId()).thenReturn(playerId);
+        when(player.getName()).thenReturn("Builder");
+        when(player.getGameMode()).thenReturn(GameMode.SURVIVAL);
+        World world = mock(World.class);
+        when(world.getUID()).thenReturn(UUID.randomUUID());
+        Block block = mock(Block.class);
+        when(block.getWorld()).thenReturn(world);
+        BlockPlaceEvent event = mock(BlockPlaceEvent.class);
+        when(event.getPlayer()).thenReturn(player);
+        when(event.getBlockPlaced()).thenReturn(block);
+        PluginSettingsProvider settings = new PluginSettingsProvider(
+            PluginSettings.from(Map.of())
+        );
+        BaseProgressListener listener = new BaseProgressListener(
+            mock(Plugin.class),
+            stateManager,
+            mock(BaseProgressionService.class),
+            mock(SecondaryProgressionService.class),
+            mock(TeleportProgressionService.class),
+            new SpawnableOverlayProgressionService(settings),
+            new BaseBoundsService(settings),
+            settings
+        );
+
+        listener.onBlockPlace(event);
+
+        assertEquals(1, updated.get().totalBlocksPlaced());
+        assertEquals(0, updated.get().blocksPlacedInBase());
+    }
+}

src/test/java/games/dmg/spigotbase/BaseSettingsCommandTest.java

@@ -0,0 +1,273 @@
+package games.dmg.spigotbase;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import java.time.Instant;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.UnaryOperator;
+import org.bukkit.ChatColor;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.PlayerInventory;
+import org.junit.jupiter.api.Test;
+
+final class BaseSettingsCommandTest {
+    @Test
+    void spawnableEnableIsIdempotentAfterUnlock() {
+        UUID playerId = UUID.randomUUID();
+        PlayerState current = PlayerState.newPlayer(playerId, "Builder")
+            .withAdministrativeLevels(1, 0, 0, 0, 0, false, false, false)
+            .withBase(
+                new BaseLocation(UUID.randomUUID(), "world", 0, 64, 0, 0, 0),
+                Instant.EPOCH
+            )
+            .withTotalBlocksPlaced(250);
+
+        CommandResult result = execute(current, "spawnable", "enable");
+
+        assertTrue(result.updated().spawnableOverlayEnabled());
+    }
+
+    @Test
+    void borderEnableIsIdempotent() {
+        UUID playerId = UUID.randomUUID();
+        PlayerState current = PlayerState.newPlayer(playerId, "Builder")
+            .withAdministrativeLevels(1, 0, 0, 0, 0, false, false, false)
+            .withBase(
+                new BaseLocation(UUID.randomUUID(), "world", 0, 64, 0, 0, 0),
+                Instant.EPOCH
+            );
+
+        CommandResult result = execute(current, "border", "enable");
+
+        assertTrue(result.updated().borderEnabled());
+    }
+
+    @Test
+    void invalidArgumentsShowUsage() {
+        UUID playerId = UUID.randomUUID();
+        Player player = mock(Player.class);
+        when(player.getUniqueId()).thenReturn(playerId);
+        when(player.getName()).thenReturn("Builder");
+        BaseStateManager stateManager = mock(BaseStateManager.class);
+        when(stateManager.player(playerId, "Builder"))
+            .thenReturn(PlayerState.newPlayer(playerId, "Builder"));
+        BaseSettingsCommand command = new BaseSettingsCommand(
+            stateManager,
+            new PluginSettingsProvider(PluginSettings.from(Map.of())),
+            mock(BaseFlightController.class)
+        );
+
+        command.onCommand(player, null, "basesettings", new String[] {"unknown"});
+
+        verify(player).sendMessage(org.mockito.ArgumentMatchers.<String>argThat(
+            message -> message.contains("Usage: /basesettings")
+        ));
+    }
+
+    @Test
+    void autocompletesValuesForEachSetting() {
+        BaseSettingsCommand command = new BaseSettingsCommand(
+            mock(BaseStateManager.class),
+            new PluginSettingsProvider(PluginSettings.from(Map.of())),
+            mock(BaseFlightController.class)
+        );
+
+        assertEquals(
+            List.of("allowed"),
+            command.onTabComplete(null, null, "basesettings", new String[] {"visitors", "a"})
+        );
+        for (String setting : List.of("navigation", "flight", "border", "spawnable", "bossbar")) {
+            assertEquals(
+                List.of("disable"),
+                command.onTabComplete(null, null, "basesettings", new String[] {setting, "d"})
+            );
+        }
+    }
+
+    @Test
+    void autocompletesSettingNames() {
+        BaseSettingsCommand command = new BaseSettingsCommand(
+            mock(BaseStateManager.class),
+            new PluginSettingsProvider(PluginSettings.from(Map.of())),
+            mock(BaseFlightController.class)
+        );
+
+        assertEquals(
+            List.of(
+                "status", "upgrade", "visitors", "navigation", "flight", "border",
+                "spawnable", "bossbar"
+            ),
+            command.onTabComplete(null, null, "basesettings", new String[] {""})
+        );
+    }
+
+    @Test
+    void upgradePurchasesBaseIv() throws Exception {
+        UUID playerId = UUID.randomUUID();
+        Player player = mock(Player.class);
+        when(player.getUniqueId()).thenReturn(playerId);
+        when(player.getName()).thenReturn("Host");
+        PlayerInventory inventory = mock(PlayerInventory.class);
+        when(player.getInventory()).thenReturn(inventory);
+        when(inventory.getStorageContents()).thenReturn(new ItemStack[] {
+            new ItemStack(Material.DIAMOND, 64),
+            new ItemStack(Material.DIAMOND, 64)
+        });
+
+        PlayerState current = PlayerState.newPlayer(playerId, "Host")
+            .withAdministrativeLevels(3, 0, 0, 0, 0, false, false, false)
+            .withBase(
+                new BaseLocation(UUID.randomUUID(), "world", 0, 64, 0, 0, 0),
+                Instant.EPOCH
+            );
+        AtomicReference<PlayerState> updated = new AtomicReference<>();
+        BaseStateManager stateManager = mock(BaseStateManager.class);
+        when(stateManager.player(playerId, "Host")).thenReturn(current);
+        when(stateManager.updateAndSave(any(), anyString(), any())).thenAnswer(invocation -> {
+            @SuppressWarnings("unchecked")
+            UnaryOperator<PlayerState> operation = invocation.getArgument(2);
+            PlayerState result = operation.apply(current);
+            updated.set(result);
+            return result;
+        });
+        BaseSettingsCommand command = new BaseSettingsCommand(
+            stateManager,
+            new PluginSettingsProvider(PluginSettings.from(Map.of())),
+            mock(BaseFlightController.class)
+        );
+
+        command.onCommand(player, null, "basesettings", new String[] {"upgrade"});
+
+        assertEquals(4, updated.get().baseLevel());
+        assertTrue(updated.get().visitorsEnabled());
+    }
+
+    @Test
+    void bossbarEnableIsIdempotent() {
+        UUID playerId = UUID.randomUUID();
+        PlayerState current = PlayerState.newPlayer(playerId, "Miner");
+
+        CommandResult result = execute(current, "bossbar", "enable");
+
+        assertTrue(result.updated().bossBarEnabled());
+    }
+
+    @Test
+    void flightDisableIsIdempotentAndRemovesGrantedFlight() {
+        UUID playerId = UUID.randomUUID();
+        PlayerState current = PlayerState.newPlayer(playerId, "Pilot")
+            .withAdministrativeLevels(1, 0, 1, 0, 0, false, true, false);
+
+        CommandResult result = execute(current, "flight", "disable");
+
+        assertFalse(result.updated().flightEnabled());
+        verify(result.flightController()).removeGrantedFlight(any(Player.class));
+    }
+
+    @Test
+    void navigationDisableIsIdempotent() {
+        UUID playerId = UUID.randomUUID();
+        PlayerState current = PlayerState.newPlayer(playerId, "Explorer")
+            .withAdministrativeLevels(2, 0, 0, 0, 0, true, false, false)
+            .withBase(
+                new BaseLocation(UUID.randomUUID(), "world", 0, 64, 0, 0, 0),
+                Instant.EPOCH
+            );
+
+        CommandResult result = execute(current, "navigation", "disable");
+
+        assertFalse(result.updated().navigationEnabled());
+    }
+
+    @Test
+    void visitorsAllowedIsIdempotent() {
+        UUID playerId = UUID.randomUUID();
+        PlayerState current = PlayerState.newPlayer(playerId, "Host")
+            .withAdministrativeLevels(4, 0, 0, 0, 0, false, false, true);
+
+        CommandResult result = execute(current, "visitors", "allowed");
+
+        assertTrue(result.updated().visitorsEnabled());
+    }
+
+    @Test
+    void defaultAndStatusDisplayTheFullProgressReport() {
+        UUID playerId = UUID.randomUUID();
+        Player player = mock(Player.class);
+        when(player.getUniqueId()).thenReturn(playerId);
+        when(player.getName()).thenReturn("Builder");
+
+        BaseStateManager stateManager = mock(BaseStateManager.class);
+        when(stateManager.player(playerId, "Builder"))
+            .thenReturn(PlayerState.newPlayer(playerId, "Builder"));
+        BaseSettingsCommand command = new BaseSettingsCommand(
+            stateManager,
+            new PluginSettingsProvider(PluginSettings.from(Map.of())),
+            mock(BaseFlightController.class)
+        );
+
+        command.onCommand(player, null, "basesettings", new String[0]);
+        command.onCommand(player, null, "basesettings", new String[] {"status"});
+
+        verify(player, times(2)).sendMessage(ChatColor.GOLD + "=== Base Progress ===");
+        verify(player, times(2)).sendMessage(
+            org.mockito.ArgumentMatchers.<String>argThat(message ->
+                message.contains("Spawnable Overlay:")
+                    && message.contains("0/250 placements")
+                    && message.contains("locked")
+            )
+        );
+        verify(player, times(2)).sendMessage(
+            org.mockito.ArgumentMatchers.<String>argThat(message ->
+            message.contains("Settings: visitors=")
+                && message.contains("navigation=")
+                && message.contains("flight=")
+                && message.contains("border=")
+                && message.contains("spawnable=")
+                && message.contains("bossbar=")
+            )
+        );
+    }
+
+    private static CommandResult execute(PlayerState current, String... arguments) {
+        Player player = mock(Player.class);
+        when(player.getUniqueId()).thenReturn(current.playerId());
+        when(player.getName()).thenReturn(current.latestName());
+
+        AtomicReference<PlayerState> updated = new AtomicReference<>();
+        BaseStateManager stateManager = mock(BaseStateManager.class);
+        when(stateManager.player(current.playerId(), current.latestName())).thenReturn(current);
+        when(stateManager.update(any(), anyString(), any())).thenAnswer(invocation -> {
+            @SuppressWarnings("unchecked")
+            UnaryOperator<PlayerState> operation = invocation.getArgument(2);
+            PlayerState result = operation.apply(current);
+            updated.set(result);
+            return result;
+        });
+        BaseFlightController flightController = mock(BaseFlightController.class);
+        BaseSettingsCommand command = new BaseSettingsCommand(
+            stateManager,
+            new PluginSettingsProvider(PluginSettings.from(Map.of())),
+            flightController
+        );
+
+        command.onCommand(player, null, "basesettings", arguments);
+        return new CommandResult(updated.get(), flightController);
+    }
+
+    private record CommandResult(PlayerState updated, BaseFlightController flightController) {
+    }
+}

src/test/java/games/dmg/spigotbase/NavigationPreferenceTest.java

@@ -1,35 +0,0 @@
-package games.dmg.spigotbase;
-
-import static org.junit.jupiter.api.Assertions.assertFalse;
-import static org.junit.jupiter.api.Assertions.assertThrows;
-import static org.junit.jupiter.api.Assertions.assertTrue;
-
-import org.junit.jupiter.api.Test;
-
-final class NavigationPreferenceTest {
-    @Test
-    void noArgumentTogglesCurrentPreference() {
-        assertFalse(NavigationPreference.resolve(true, new String[0]));
-        assertTrue(NavigationPreference.resolve(false, new String[0]));
-    }
-
-    @Test
-    void explicitModesAreIdempotent() {
-        assertTrue(NavigationPreference.resolve(true, new String[] {"on"}));
-        assertTrue(NavigationPreference.resolve(false, new String[] {"on"}));
-        assertFalse(NavigationPreference.resolve(true, new String[] {"off"}));
-        assertFalse(NavigationPreference.resolve(false, new String[] {"off"}));
-    }
-
-    @Test
-    void rejectsUnknownOrExtraArguments() {
-        assertThrows(
-            IllegalArgumentException.class,
-            () -> NavigationPreference.resolve(false, new String[] {"maybe"})
-        );
-        assertThrows(
-            IllegalArgumentException.class,
-            () -> NavigationPreference.resolve(false, new String[] {"on", "off"})
-        );
-    }
-}

src/test/java/games/dmg/spigotbase/PlayerStateTest.java

@@ -1,13 +1,48 @@
 package games.dmg.spigotbase;
 
+import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import java.time.Instant;
 import java.util.Map;
 import java.util.Optional;
 import java.util.UUID;
 import org.junit.jupiter.api.Test;
 
 final class PlayerStateTest {
+    @Test
+    void spawnableOverlayProgressAndPreferenceCanBeUpdated() {
+        PlayerState player = PlayerState.newPlayer(UUID.randomUUID(), "Alex")
+            .withAdministrativeLevels(1, 0, 0, 0, 0, false, false, false)
+            .withBase(
+                new BaseLocation(UUID.randomUUID(), "world", 0, 64, 0, 0, 0),
+                Instant.EPOCH
+            );
+
+        PlayerState updated = player
+            .withTotalBlocksPlaced(250)
+            .withSpawnableOverlayEnabled(true);
+
+        assertTrue(updated.spawnableOverlayEnabled());
+        assertTrue(updated.totalBlocksPlaced() == 250);
+    }
+
+    @Test
+    void borderVisualizationIsDisabledByDefaultAndCanBeEnabled() {
+        UUID playerId = UUID.randomUUID();
+        PlayerState player = PlayerState.newPlayer(playerId, "Alex");
+        PlayerState established = player
+            .withAdministrativeLevels(1, 0, 0, 0, 0, false, false, false)
+            .withBase(
+                new BaseLocation(UUID.randomUUID(), "world", 0, 64, 0, 0, 0),
+                Instant.EPOCH
+            );
+
+        assertFalse(player.borderEnabled());
+        assertTrue(established.withBorderEnabled(true).borderEnabled());
+    }
+
     @Test
     void rejectsLevelsOutsideKnownRanges() {
         UUID playerId = UUID.randomUUID();

src/test/java/games/dmg/spigotbase/PluginMetadataTest.java

@@ -1,14 +1,68 @@
 package games.dmg.spigotbase;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 
 import java.io.InputStream;
+import java.util.List;
 import java.util.Map;
 import org.junit.jupiter.api.Test;
 import org.yaml.snakeyaml.Yaml;
 
 final class PluginMetadataTest {
+    @Test
+    void homeadminAliasesBaseadmin() {
+        Map<?, ?> commands = commands();
+
+        Map<?, ?> admin = (Map<?, ?>) commands.get("baseadmin");
+        assertEquals(List.of("homeadmin"), admin.get("aliases"));
+    }
+
+    @Test
+    void doesNotDeclareSupersededSettingsCommands() {
+        Map<?, ?> commands = commands();
+
+        for (String command : List.of(
+            "baseprogress", "basenavigation", "baseflight", "basevisitors"
+        )) {
+            assertFalse(commands.containsKey(command), command);
+        }
+    }
+
+    @Test
+    void homesettingsAliasesBasesettings() {
+        Map<?, ?> commands = commands();
+
+        Map<?, ?> settings = (Map<?, ?>) commands.get("basesettings");
+        assertNotNull(settings);
+        assertEquals(List.of("homesettings"), settings.get("aliases"));
+    }
+
+    @Test
+    void sethomeAliasesSetbase() {
+        Map<?, ?> commands = commands();
+
+        Map<?, ?> setbase = (Map<?, ?>) commands.get("setbase");
+        assertEquals(List.of("sethome"), setbase.get("aliases"));
+    }
+
+    @Test
+    void homeAliasesBase() {
+        Map<?, ?> commands = commands();
+
+        Map<?, ?> base = (Map<?, ?>) commands.get("base");
+        assertEquals(List.of("home"), base.get("aliases"));
+    }
+
+    @Test
+    void visitAliasesGotobase() {
+        Map<?, ?> commands = commands();
+
+        Map<?, ?> gotobase = (Map<?, ?>) commands.get("gotobase");
+        assertEquals(List.of("visit"), gotobase.get("aliases"));
+    }
+
     @Test
     void declaresPluginEntrypointCommandsAndPermissions() {
         InputStream stream = getClass().getClassLoader().getResourceAsStream("plugin.yml");
@@ -21,8 +75,7 @@ final class PluginMetadataTest {
 
         Map<?, ?> commands = (Map<?, ?>) plugin.get("commands");
         for (String command : new String[] {
-            "setbase", "base", "basenavigation", "baseflight",
-            "basevisitors", "gotobase", "baseprogress", "baseadmin"
+            "setbase", "base", "gotobase", "basesettings", "baseadmin"
         }) {
             assertNotNull(commands.get(command), command);
         }
@@ -30,4 +83,11 @@ final class PluginMetadataTest {
         Map<?, ?> permissions = (Map<?, ?>) plugin.get("permissions");
         assertNotNull(permissions.get("spigotbase.admin"));
     }
+
+    private Map<?, ?> commands() {
+        InputStream stream = getClass().getClassLoader().getResourceAsStream("plugin.yml");
+        assertNotNull(stream);
+        Map<?, ?> plugin = new Yaml().load(stream);
+        return (Map<?, ?>) plugin.get("commands");
+    }
 }

src/test/java/games/dmg/spigotbase/PluginSettingsTest.java

@@ -18,6 +18,7 @@ final class PluginSettingsTest {
         assertEquals(86_400L, settings.relocationCooldownSeconds());
         assertEquals(5, settings.flightWarningBuffer());
         assertEquals(200, settings.teleportUnlockPlacements());
+        assertEquals(250, settings.spawnableOverlayUnlockPlacements());
         assertEquals(10_800L, settings.initialTeleportCooldownSeconds());
         assertEquals(128, settings.visitorUnlockDiamondCost());
     }

src/test/java/games/dmg/spigotbase/SpawnableBlockPolicyTest.java

@@ -0,0 +1,48 @@
+package games.dmg.spigotbase;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import org.bukkit.block.Block;
+import org.bukkit.block.BlockFace;
+import org.bukkit.block.data.type.Slab;
+import org.junit.jupiter.api.Test;
+
+final class SpawnableBlockPolicyTest {
+    @Test
+    void acceptsDarkSolidSurfaceWithTwoPassableBlocksAbove() {
+        Block surface = mock(Block.class);
+        Block above = mock(Block.class);
+        Block secondAbove = mock(Block.class);
+        Slab slab = mock(Slab.class);
+        when(slab.getType()).thenReturn(Slab.Type.TOP);
+        when(surface.getBlockData()).thenReturn(slab);
+        when(surface.getRelative(BlockFace.UP)).thenReturn(above);
+        when(above.getRelative(BlockFace.UP)).thenReturn(secondAbove);
+        when(above.isPassable()).thenReturn(true);
+        when(secondAbove.isPassable()).thenReturn(true);
+        when(above.getLightFromBlocks()).thenReturn((byte) 0);
+        when(above.getLightFromSky()).thenReturn((byte) 0);
+
+        assertTrue(SpawnableBlockPolicy.isCandidate(surface));
+    }
+
+    @Test
+    void rejectsBlockLitSurface() {
+        Block surface = mock(Block.class);
+        Block above = mock(Block.class);
+        Block secondAbove = mock(Block.class);
+        Slab slab = mock(Slab.class);
+        when(slab.getType()).thenReturn(Slab.Type.TOP);
+        when(surface.getBlockData()).thenReturn(slab);
+        when(surface.getRelative(BlockFace.UP)).thenReturn(above);
+        when(above.getRelative(BlockFace.UP)).thenReturn(secondAbove);
+        when(above.isPassable()).thenReturn(true);
+        when(secondAbove.isPassable()).thenReturn(true);
+        when(above.getLightFromBlocks()).thenReturn((byte) 1);
+
+        assertFalse(SpawnableBlockPolicy.isCandidate(surface));
+    }
+}

src/test/java/games/dmg/spigotbase/SpawnableOverlayControllerTest.java

@@ -0,0 +1,85 @@
+package games.dmg.spigotbase;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.Mockito.atLeastOnce;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import java.time.Instant;
+import java.util.Map;
+import java.util.UUID;
+import org.bukkit.Location;
+import org.bukkit.Particle;
+import org.bukkit.Server;
+import org.bukkit.World;
+import org.bukkit.block.Block;
+import org.bukkit.block.BlockFace;
+import org.bukkit.block.data.type.Slab;
+import org.bukkit.entity.Player;
+import org.junit.jupiter.api.Test;
+
+final class SpawnableOverlayControllerTest {
+    @Test
+    void ownerReceivesBoundedRedParticlesForNearbyCandidates() {
+        UUID playerId = UUID.randomUUID();
+        UUID worldId = UUID.randomUUID();
+        PlayerState state = PlayerState.newPlayer(playerId, "Builder")
+            .withAdministrativeLevels(1, 0, 0, 0, 0, false, false, false)
+            .withBase(new BaseLocation(worldId, "world", 0, 64, 0, 0, 0), Instant.EPOCH)
+            .withTotalBlocksPlaced(250)
+            .withSpawnableOverlayEnabled(true);
+
+        Block surface = mock(Block.class);
+        Block above = mock(Block.class);
+        Block secondAbove = mock(Block.class);
+        Slab slab = mock(Slab.class);
+        when(slab.getType()).thenReturn(Slab.Type.TOP);
+        when(surface.getBlockData()).thenReturn(slab);
+        when(surface.getRelative(BlockFace.UP)).thenReturn(above);
+        when(above.getRelative(BlockFace.UP)).thenReturn(secondAbove);
+        when(above.isPassable()).thenReturn(true);
+        when(secondAbove.isPassable()).thenReturn(true);
+        when(above.getLightFromBlocks()).thenReturn((byte) 0);
+        when(above.getLightFromSky()).thenReturn((byte) 0);
+
+        World world = mock(World.class);
+        when(world.getUID()).thenReturn(worldId);
+        when(world.getMinHeight()).thenReturn(-64);
+        when(world.getMaxHeight()).thenReturn(320);
+        when(world.getBlockAt(anyInt(), anyInt(), anyInt()))
+            .thenReturn(surface);
+        Player player = mock(Player.class);
+        when(player.getUniqueId()).thenReturn(playerId);
+        when(player.getName()).thenReturn("Builder");
+        when(player.getWorld()).thenReturn(world);
+        when(player.getLocation()).thenReturn(new Location(world, 0.5, 65.0, 0.5));
+        Server server = mock(Server.class);
+        doReturn(java.util.List.of(player)).when(server).getOnlinePlayers();
+        BaseStateManager stateManager = mock(BaseStateManager.class);
+        when(stateManager.player(playerId, "Builder")).thenReturn(state);
+        PluginSettingsProvider settings = new PluginSettingsProvider(
+            PluginSettings.from(Map.of())
+        );
+
+        SpawnableOverlayController controller = new SpawnableOverlayController(
+            server,
+            stateManager,
+            new BaseBoundsService(settings),
+            settings
+        );
+        controller.run();
+        controller.run();
+        controller.run();
+
+        verify(player, atLeastOnce()).spawnParticle(
+            eq(Particle.DUST),
+            any(Location.class),
+            eq(1),
+            any(Particle.DustOptions.class)
+        );
+    }
+}

src/test/java/games/dmg/spigotbase/SpawnableOverlayProgressionServiceTest.java

@@ -0,0 +1,24 @@
+package games.dmg.spigotbase;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.Map;
+import java.util.UUID;
+import org.junit.jupiter.api.Test;
+
+final class SpawnableOverlayProgressionServiceTest {
+    @Test
+    void twoHundredFiftiethPlacementUnlocksOverlay() {
+        PlayerState player = PlayerState.newPlayer(UUID.randomUUID(), "Builder")
+            .withTotalBlocksPlaced(249);
+        SpawnableOverlayProgressionService service = new SpawnableOverlayProgressionService(
+            new PluginSettingsProvider(PluginSettings.from(Map.of()))
+        );
+
+        SpawnableOverlayProgressionUpdate update = service.recordPlacement(player);
+
+        assertEquals(250, update.player().totalBlocksPlaced());
+        assertTrue(update.unlocked());
+    }
+}

src/test/java/games/dmg/spigotbase/YamlBaseStateRepositoryTest.java

@@ -28,7 +28,10 @@ final class YamlBaseStateRepositoryTest {
             true, true, false, true,
             Optional.of(Instant.ofEpochMilli(1_750_000_000_000L)),
             Optional.of(Instant.ofEpochMilli(1_750_000_100_000L)),
-            Map.of(ownerId, Instant.ofEpochMilli(1_750_001_000_000L))
+            Map.of(ownerId, Instant.ofEpochMilli(1_750_001_000_000L)),
+            true,
+            2_500,
+            true
         );
         PersistentState expected = new PersistentState(Map.of(playerId, player));
         YamlBaseStateRepository repository =
@@ -39,6 +42,44 @@ final class YamlBaseStateRepositoryTest {
         assertEquals(expected, repository.load());
     }
 
+    @Test
+    void olderStateUsesKnownInBasePlacementsAsTotalPlacementMinimum() throws Exception {
+        UUID playerId = UUID.randomUUID();
+        Path stateFile = temporaryDirectory.resolve("state.yml");
+        Files.writeString(stateFile, """
+            players:
+              %s:
+                name: Alex
+                blocks-placed-in-base: 225
+            """.formatted(playerId));
+
+        PlayerState player = new YamlBaseStateRepository(stateFile)
+            .load()
+            .players()
+            .get(playerId);
+
+        assertEquals(225, player.totalBlocksPlaced());
+        assertFalse(player.spawnableOverlayEnabled());
+    }
+
+    @Test
+    void olderStateWithoutBorderPreferenceDefaultsToDisabled() throws Exception {
+        UUID playerId = UUID.randomUUID();
+        Path stateFile = temporaryDirectory.resolve("state.yml");
+        Files.writeString(stateFile, """
+            players:
+              %s:
+                name: Alex
+            """.formatted(playerId));
+
+        PlayerState player = new YamlBaseStateRepository(stateFile)
+            .load()
+            .players()
+            .get(playerId);
+
+        assertFalse(player.borderEnabled());
+    }
+
     @Test
     void invalidRecordsCannotGrantProgression() throws Exception {
         UUID playerId = UUID.randomUUID();