diff --git a/SpigotCore/SpigotCore_Main/src/de/steamwar/core/WorldIdentifier.java b/SpigotCore/SpigotCore_Main/src/de/steamwar/core/WorldIdentifier.java
index fb02eab9..a3c575d1 100644
--- a/SpigotCore/SpigotCore_Main/src/de/steamwar/core/WorldIdentifier.java
+++ b/SpigotCore/SpigotCore_Main/src/de/steamwar/core/WorldIdentifier.java
@@ -27,8 +27,7 @@ import net.minecraft.resources.ResourceKey;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.level.Level;
 
-import java.nio.charset.StandardCharsets;
-import java.util.HexFormat;
+import java.util.Locale;
 
 @Linked
 public class WorldIdentifier {
@@ -40,7 +39,7 @@ public class WorldIdentifier {
     }
 
     public static void setArena(String map) {
-        set("arena/" + Core.getVersion() + "/" + HexFormat.of().formatHex(map.getBytes(StandardCharsets.UTF_8)));
+        set("arena/" + Core.getVersion() + "/" + map.toLowerCase(Locale.ROOT).replaceAll("[^a-z0-9._-]", ""));
     }
 
     public WorldIdentifier() {