diff --git a/CHANGELOG.md b/CHANGELOG.md
index acf1624..4badf34 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@
 - Added independent control of initial connections on newly placed fences, panes/bars, walls, stairs, fence gates, and chests.
 - Kept placement-time connections separate from neighbor `block-updates`, with per-material overrides for both sides of a placement.
 - Added a GitHub Actions workflow that tests both Spigot and Paper API profiles and uploads the shaded JAR.
+- Added `openphysicscontrol.set.current-world` for delegating rule changes only in a player's current world, across commands and the GUI.
 
 ## 2.7.0 - 2026-07-30
 
diff --git a/README.md b/README.md
index 7303d85..a8d08ad 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,15 @@ OpenPhysicsControl 是從零撰寫、採 MIT 授權的 Bukkit 世界物理控制
 /opc reload
 ```
 
+### 權限
+
+- `openphysicscontrol.menu`：開啟玩家當下世界的物理規則選單。
+- `openphysicscontrol.set`：透過指令或選單修改任何已載入世界。
+- `openphysicscontrol.set.current-world`：只允許玩家透過指令或選單修改當下所在世界；即使在指令中指定其他世界，或開啟選單後移動到其他世界，也不會放行。
+- `openphysicscontrol.reload`：重新載入設定與世界規則。
+
+OP 仍可修改所有世界。若玩家同時擁有 `openphysicscontrol.set` 與 `openphysicscontrol.set.current-world`，範圍較大的 `openphysicscontrol.set` 優先。
+
 指令狀態以規則行為為準：大多數規則的 `on` 代表物理正常運作、`off` 代表停止；`block-hit-projectile-removal` 則是相容舊版的可選清理，`on` 時會移除命中方塊的箭矢與三叉戟，預設 `off` 以保留原版箭矢留存。
 
 `oxygen-depletion` 的 `off` 只會阻止水中氧氣減少，離水後仍會恢復氧氣；`drowning-damage` 是獨立規則。`fire-damage` 不會攔截仙人掌、甜莓叢或尖滴水石等一般接觸傷害，這些不屬於火焰與高溫控制範圍。
diff --git a/src/main/java/dev/openphysicscontrol/OpenPhysicsControlPlugin.java b/src/main/java/dev/openphysicscontrol/OpenPhysicsControlPlugin.java
index f666efc..9574e40 100644
--- a/src/main/java/dev/openphysicscontrol/OpenPhysicsControlPlugin.java
+++ b/src/main/java/dev/openphysicscontrol/OpenPhysicsControlPlugin.java
@@ -19,6 +19,9 @@
 import java.util.Map;
 
 public final class OpenPhysicsControlPlugin extends JavaPlugin implements Listener {
+    static final String SET_PERMISSION = "openphysicscontrol.set";
+    static final String SET_CURRENT_WORLD_PERMISSION = "openphysicscontrol.set.current-world";
+
     private LocaleService locales;
     private Messages messages;
     private RuleStore rules;
@@ -69,7 +72,7 @@ private boolean openMenu(CommandSender sender) {
     }
 
     private boolean setRule(CommandSender sender, String[] args) {
-        if (!sender.isOp() && !sender.hasPermission("openphysicscontrol.set")) {
+        if (!hasAnyWorldEditPermission(sender)) {
             this.messages.send(sender, "no-permission");
             return true;
         }
@@ -104,6 +107,7 @@ private boolean setRule(CommandSender sender, String[] args) {
             this.messages.send(sender, "world-not-found", Map.of("world", args.length >= 4 ? args[3] : "?"));
             return true;
         }
+        if (!ensureCanEditWorld(sender, world)) return true;
         boolean enabled = this.rules.set(world, rule, requested);
         this.messages.send(sender, "rule-changed", Map.of(
             "rule", this.messages.plain(sender, rule.messageKey()),
@@ -114,7 +118,7 @@ private boolean setRule(CommandSender sender, String[] args) {
     }
 
     private boolean setMaterial(CommandSender sender, String[] args) {
-        if (!sender.isOp() && !sender.hasPermission("openphysicscontrol.set")) {
+        if (!hasAnyWorldEditPermission(sender)) {
             this.messages.send(sender, "no-permission");
             return true;
         }
@@ -143,6 +147,7 @@ private boolean setMaterial(CommandSender sender, String[] args) {
             this.messages.send(sender, "world-not-found", Map.of("world", args.length >= 5 ? args[4] : "?"));
             return true;
         }
+        if (!ensureCanEditWorld(sender, world)) return true;
         String state = args[3].toLowerCase(Locale.ROOT);
         if (state.equals("clear") || state.equals("reset")) {
             this.rules.clearMaterial(world, rule, material);
@@ -217,7 +222,7 @@ public List<String> onTabComplete(CommandSender sender, Command command, String
         } else if (args.length == 3 && args[0].equalsIgnoreCase("set")) {
             options.addAll(List.of("on", "off", "toggle"));
         } else if (args.length == 4 && args[0].equalsIgnoreCase("set")) {
-            for (World world : this.getServer().getWorlds()) options.add(world.getName());
+            addEditableWorlds(sender, options);
         } else if (args.length == 2 && (args[0].equalsIgnoreCase("material") || args[0].equalsIgnoreCase("materials"))) {
             for (Rule rule : Rule.values()) options.add(rule.key());
         } else if (args.length == 3 && (args[0].equalsIgnoreCase("material") || args[0].equalsIgnoreCase("materials"))) {
@@ -227,7 +232,7 @@ public List<String> onTabComplete(CommandSender sender, Command command, String
         } else if (args.length == 4 && (args[0].equalsIgnoreCase("material") || args[0].equalsIgnoreCase("materials"))) {
             options.addAll(List.of("on", "off", "toggle", "clear"));
         } else if (args.length == 5 && (args[0].equalsIgnoreCase("material") || args[0].equalsIgnoreCase("materials"))) {
-            for (World world : this.getServer().getWorlds()) options.add(world.getName());
+            addEditableWorlds(sender, options);
         } else if (args.length == 2 && (args[0].equalsIgnoreCase("language") || args[0].equalsIgnoreCase("lang"))) {
             options.add("auto");
             options.addAll(this.locales.available());
@@ -237,6 +242,39 @@ public List<String> onTabComplete(CommandSender sender, Command command, String
         return options;
     }
 
+    boolean ensureCanEditWorld(CommandSender sender, World world) {
+        if (canEditWorld(sender, world)) return true;
+        String message = sender instanceof Player && sender.hasPermission(SET_CURRENT_WORLD_PERMISSION)
+            ? "current-world-only"
+            : "no-permission";
+        this.messages.send(sender, message);
+        return false;
+    }
+
+    private boolean canEditWorld(CommandSender sender, World world) {
+        boolean playerWithCurrentWorldPermission = sender instanceof Player player
+            && player.hasPermission(SET_CURRENT_WORLD_PERMISSION);
+        boolean currentWorld = sender instanceof Player player && player.getWorld() == world;
+        return grantsWorldEdit(sender.isOp(), sender.hasPermission(SET_PERMISSION),
+            playerWithCurrentWorldPermission, currentWorld);
+    }
+
+    private boolean hasAnyWorldEditPermission(CommandSender sender) {
+        return sender.isOp() || sender.hasPermission(SET_PERMISSION)
+            || sender instanceof Player && sender.hasPermission(SET_CURRENT_WORLD_PERMISSION);
+    }
+
+    private void addEditableWorlds(CommandSender sender, List<String> options) {
+        for (World world : this.getServer().getWorlds()) {
+            if (canEditWorld(sender, world)) options.add(world.getName());
+        }
+    }
+
+    static boolean grantsWorldEdit(boolean operator, boolean allWorldsPermission,
+                                   boolean currentWorldPermission, boolean currentWorld) {
+        return operator || allWorldsPermission || (currentWorldPermission && currentWorld);
+    }
+
     @EventHandler(ignoreCancelled = true)
     public void inventoryClick(InventoryClickEvent event) {
         if (!(event.getInventory().getHolder() instanceof RulesMenu menu)) return;
diff --git a/src/main/java/dev/openphysicscontrol/RulesMenu.java b/src/main/java/dev/openphysicscontrol/RulesMenu.java
index 8ac15d3..cbb819f 100644
--- a/src/main/java/dev/openphysicscontrol/RulesMenu.java
+++ b/src/main/java/dev/openphysicscontrol/RulesMenu.java
@@ -79,10 +79,7 @@ public void click(int rawSlot) {
 
         Rule rule = this.ruleSlots.get(rawSlot);
         if (rule == null) return;
-        if (!this.viewer.isOp() && !this.viewer.hasPermission("openphysicscontrol.set")) {
-            this.plugin.messages().send(this.viewer, "no-permission");
-            return;
-        }
+        if (!this.plugin.ensureCanEditWorld(this.viewer, this.world)) return;
         boolean enabled = this.plugin.rules().set(this.world, rule, null);
         refreshRule(rawSlot, rule);
         this.plugin.messages().send(this.viewer, "rule-changed", Map.of(
diff --git a/src/main/resources/lang/en.yml b/src/main/resources/lang/en.yml
index c0c5294..e8ba18b 100644
--- a/src/main/resources/lang/en.yml
+++ b/src/main/resources/lang/en.yml
@@ -1,5 +1,6 @@
 prefix: '<gold>[OpenPhysicsControl]</gold>'
 no-permission: '<prefix> <red>You do not have permission.</red>'
+current-world-only: '<prefix> <red>You may only change physics in your current world.</red>'
 players-only: '<prefix> <red>This command is only available to players.</red>'
 world-not-found: '<prefix> <red>World <world> was not found.</red>'
 rule-not-found: '<prefix> <red>Unknown rule <rule>.</red>'
diff --git a/src/main/resources/lang/zh_tw.yml b/src/main/resources/lang/zh_tw.yml
index 6c68fdf..c5963a1 100644
--- a/src/main/resources/lang/zh_tw.yml
+++ b/src/main/resources/lang/zh_tw.yml
@@ -1,5 +1,6 @@
 prefix: '<gold>[OpenPhysicsControl]</gold>'
 no-permission: '<prefix> <red>你沒有權限。</red>'
+current-world-only: '<prefix> <red>你只能修改目前所在世界的物理規則。</red>'
 players-only: '<prefix> <red>此指令只能由玩家使用。</red>'
 world-not-found: '<prefix> <red>找不到世界 <world>。</red>'
 rule-not-found: '<prefix> <red>未知規則 <rule>。</red>'
diff --git a/src/main/resources/plugin.yml b/src/main/resources/plugin.yml
index 01cb971..411efd8 100644
--- a/src/main/resources/plugin.yml
+++ b/src/main/resources/plugin.yml
@@ -12,8 +12,14 @@ commands:
     usage: '/<command> [set|material|language|reload]'
 permissions:
   openphysicscontrol.menu:
+    description: 'Open the physics rules menu for the current world'
     default: op
   openphysicscontrol.set:
+    description: 'Change physics rules in any loaded world'
     default: op
+  openphysicscontrol.set.current-world:
+    description: "Change physics rules only in the player's current world"
+    default: false
   openphysicscontrol.reload:
+    description: 'Reload OpenPhysicsControl configuration and world rules'
     default: op
diff --git a/src/test/java/dev/openphysicscontrol/ResourceTest.java b/src/test/java/dev/openphysicscontrol/ResourceTest.java
index b4ee359..22a8523 100644
--- a/src/test/java/dev/openphysicscontrol/ResourceTest.java
+++ b/src/test/java/dev/openphysicscontrol/ResourceTest.java
@@ -29,6 +29,11 @@ void descriptorKeepsRequestedCompatibility() {
         Map<String, Object> commands = (Map<String, Object>) plugin.get("commands");
         Map<String, Object> command = (Map<String, Object>) commands.get("openphysics");
         assertEquals(List.of("ophysics", "opc", "pc"), command.get("aliases"));
+        Map<String, Object> permissions = (Map<String, Object>) plugin.get("permissions");
+        assertTrue(permissions.containsKey(OpenPhysicsControlPlugin.SET_PERMISSION));
+        Map<String, Object> currentWorld = (Map<String, Object>) permissions.get(
+            OpenPhysicsControlPlugin.SET_CURRENT_WORLD_PERMISSION);
+        assertEquals(Boolean.FALSE, currentWorld.get("default"));
     }
 
     @Test
diff --git a/src/test/java/dev/openphysicscontrol/WorldEditPermissionTest.java b/src/test/java/dev/openphysicscontrol/WorldEditPermissionTest.java
new file mode 100644
index 0000000..99656c9
--- /dev/null
+++ b/src/test/java/dev/openphysicscontrol/WorldEditPermissionTest.java
@@ -0,0 +1,21 @@
+package dev.openphysicscontrol;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+final class WorldEditPermissionTest {
+    @Test
+    void operatorsAndAllWorldPermissionAlwaysGrantWorldEdits() {
+        assertTrue(OpenPhysicsControlPlugin.grantsWorldEdit(true, false, false, false));
+        assertTrue(OpenPhysicsControlPlugin.grantsWorldEdit(false, true, false, false));
+    }
+
+    @Test
+    void currentWorldPermissionOnlyGrantsThePlayersCurrentWorld() {
+        assertTrue(OpenPhysicsControlPlugin.grantsWorldEdit(false, false, true, true));
+        assertFalse(OpenPhysicsControlPlugin.grantsWorldEdit(false, false, true, false));
+        assertFalse(OpenPhysicsControlPlugin.grantsWorldEdit(false, false, false, true));
+    }
+}