diff --git a/patches/api/Add-methods-to-get-world-by-key.patch b/patches/api/Add-methods-to-get-world-by-key.patch
index 369e91ed1d..6efd82d614 100644
--- a/patches/api/Add-methods-to-get-world-by-key.patch
+++ b/patches/api/Add-methods-to-get-world-by-key.patch
@@ -49,6 +49,21 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
      /**
       * Create a new virtual {@link WorldBorder}.
       * <p>
+diff --git a/src/main/java/org/bukkit/UnsafeValues.java b/src/main/java/org/bukkit/UnsafeValues.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/UnsafeValues.java
++++ b/src/main/java/org/bukkit/UnsafeValues.java
+@@ -0,0 +0,0 @@ public interface UnsafeValues {
+      * @throws IllegalArgumentException if there isn't a registry for that type
+      */
+     <T extends Keyed> @org.jetbrains.annotations.NotNull Registry<T> registryFor(Class<T> classOfT);
++
++    /**
++     * Just don't use it.
++     */
++    @org.jetbrains.annotations.NotNull String getMainLevelName();
+     // Paper end
+ }
 diff --git a/src/main/java/org/bukkit/WorldCreator.java b/src/main/java/org/bukkit/WorldCreator.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/org/bukkit/WorldCreator.java
@@ -67,9 +82,21 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
      public WorldCreator(@NotNull String name) {
 -        if (name == null) {
 -            throw new IllegalArgumentException("World name cannot be null");
--        }
 +        // Paper start
-+        this(name, NamespacedKey.minecraft(name.toLowerCase(java.util.Locale.ENGLISH).replace(" ", "_")));
++        this(name, getWorldKey(name));
++    }
++
++    private static NamespacedKey getWorldKey(String name) {
++        final String mainLevelName = Bukkit.getUnsafe().getMainLevelName();
++        if (name.equals(mainLevelName)) {
++            return NamespacedKey.minecraft("overworld");
++        } else if (name.equals(mainLevelName + "_nether")) {
++            return NamespacedKey.minecraft("the_nether");
++        } else if (name.equals(mainLevelName + "_the_end")) {
++            return NamespacedKey.minecraft("the_end");
++        } else {
++            return NamespacedKey.minecraft(name.toLowerCase(java.util.Locale.ENGLISH).replace(" ", "_"));
+         }
 +    }
  
 -        this.name = name;
diff --git a/patches/api/Item-Rarity-API.patch b/patches/api/Item-Rarity-API.patch
index fa67b39d2b..808d3aa2c0 100644
--- a/patches/api/Item-Rarity-API.patch
+++ b/patches/api/Item-Rarity-API.patch
@@ -65,9 +65,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- a/src/main/java/org/bukkit/UnsafeValues.java
 +++ b/src/main/java/org/bukkit/UnsafeValues.java
 @@ -0,0 +0,0 @@ public interface UnsafeValues {
-      * @throws IllegalArgumentException if there isn't a registry for that type
+      * Just don't use it.
       */
-     <T extends Keyed> @org.jetbrains.annotations.NotNull Registry<T> registryFor(Class<T> classOfT);
+     @org.jetbrains.annotations.NotNull String getMainLevelName();
 +
 +    /**
 +     * Gets the item rarity of a material. The material <b>MUST</b> be an item.
diff --git a/patches/server/Add-methods-to-get-world-by-key.patch b/patches/server/Add-methods-to-get-world-by-key.patch
index fa8ddb0e3b..85e91fcea1 100644
--- a/patches/server/Add-methods-to-get-world-by-key.patch
+++ b/patches/server/Add-methods-to-get-world-by-key.patch
@@ -51,3 +51,19 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
      public void addWorld(World world) {
          // Check if a World already exists with the UID.
          if (this.getWorld(world.getUID()) != null) {
+diff --git a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
++++ b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
+@@ -0,0 +0,0 @@ public final class CraftMagicNumbers implements UnsafeValues {
+     public <T extends org.bukkit.Keyed> Registry<T> registryFor(Class<T> classOfT) {
+         return io.papermc.paper.registry.PaperRegistry.getRegistry(classOfT);
+     }
++
++    @Override
++    public String getMainLevelName() {
++        return ((net.minecraft.server.dedicated.DedicatedServer) net.minecraft.server.MinecraftServer.getServer()).getProperties().levelName;
++    }
+     // Paper end
+ 
+     /**
diff --git a/patches/server/Item-Rarity-API.patch b/patches/server/Item-Rarity-API.patch
index 2e7b9ac642..7e1d6190e4 100644
--- a/patches/server/Item-Rarity-API.patch
+++ b/patches/server/Item-Rarity-API.patch
@@ -9,8 +9,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
 +++ b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
 @@ -0,0 +0,0 @@ public final class CraftMagicNumbers implements UnsafeValues {
-     public <T extends org.bukkit.Keyed> Registry<T> registryFor(Class<T> classOfT) {
-         return io.papermc.paper.registry.PaperRegistry.getRegistry(classOfT);
+     public String getMainLevelName() {
+         return ((net.minecraft.server.dedicated.DedicatedServer) net.minecraft.server.MinecraftServer.getServer()).getProperties().levelName;
      }
 +
 +    @Override