diff --git a/src/main/java/de/butzlabben/world/util/PapiExtension.java b/src/main/java/de/butzlabben/world/util/PapiExtension.java
new file mode 100644
index 0000000..4ecd42d
--- /dev/null
+++ b/src/main/java/de/butzlabben/world/util/PapiExtension.java
@@ -0,0 +1,78 @@
+package de.butzlabben.world.util;
+
+import de.butzlabben.world.WorldSystem;
+import de.butzlabben.world.config.DependenceConfig;
+import de.butzlabben.world.config.WorldConfig;
+import de.butzlabben.world.wrapper.SystemWorld;
+import de.butzlabben.world.wrapper.WorldPlayer;
+import me.clip.placeholderapi.expansion.PlaceholderExpansion;
+import me.clip.placeholderapi.PlaceholderAPI;
+import org.bukkit.Bukkit;
+import org.bukkit.OfflinePlayer;
+import org.bukkit.World;
+import org.bukkit.entity.Player;
+
+import java.util.Objects;
+
+public class PapiExtension extends PlaceholderExpansion {
+
+    private final WorldSystem worldSystem = WorldSystem.getInstance();
+
+    @Override
+    public String getIdentifier() {
+        return "worldsystem";
+    }
+
+    @Override
+    public String getAuthor() {
+        return "Butzlabben";
+    }
+
+    @Override
+    public String getVersion() {
+        return worldSystem.getDescription().getVersion();
+    }
+
+    @Override
+    public String onRequest(OfflinePlayer p, String params) {
+        DependenceConfig config = new DependenceConfig(p);
+        switch (params) {
+            case "has_world":
+                String has_world = "%worldsystem_has_world%";
+                has_world = PlaceholderAPI.setPlaceholders(event.getPlayer(), has_world);
+                event.setJoinMessage(joinText);
+                return new DependenceConfig(p).hasWorld() + "";
+            case "is_creator":
+                WorldPlayer player = new WorldPlayer(Objects.requireNonNull(Bukkit.getPlayer(p.getUniqueId())));
+                if (!player.isOnSystemWorld())
+                    return "false";
+                return player.isOwnerofWorld() + "";
+            case "world_name_of_player":
+                if (!config.hasWorld())
+                    return "none";
+                else
+                    return config.getWorldname();
+            case "world_of_player_loaded":
+                if (!config.hasWorld())
+                    return "none";
+                return SystemWorld.getSystemWorld(config.getWorldname()).isLoaded() + "";
+            case "pretty_world_name":
+                if (!p.isOnline()) {
+                    if (!config.hasWorld()) {
+                        Player p1 = p.getPlayer();
+                        if (p1 != null && p1.isOnline())
+                            return p1.getLocation().getWorld().getName();
+                        return "none";
+                    }
+                    return config.getOwner().getName();
+                } else {
+                    World world = ((Player) p).getWorld();
+                    if (WorldConfig.exists(world.getName()))
+                        return WorldConfig.getWorldConfig(world.getName()).getOwnerName();
+                    return world.getName();
+                }
+            default:
+                throw new IllegalArgumentException("No placeholder named\"" + getIdentifier() + "_" + params + "\" is known");
+        }
+    }
+}