diff --git a/.github/workflows/generic.platform_uploads.yml b/.github/workflows/generic.platform_uploads.yml
index 1e994455f..c5d488a99 100644
--- a/.github/workflows/generic.platform_uploads.yml
+++ b/.github/workflows/generic.platform_uploads.yml
@@ -107,7 +107,7 @@ jobs:
         files: '["${{ github.workspace }}/${{ inputs.plugin_name }}-${{ steps.release-info.outputs.tag_name }}.jar"]'
         name: ${{ steps.release-info.outputs.tag_name }}
         changelog: ${{ steps.release-artifact.outputs.body }}
-        game_versions: 1.21.11, 1.21.10, 1.21.9, 1.21.8, 1.21.7, 1.21.6, 1.21.5, 1.21.4, 1.21.3, 1.21.2, 1.21.1, 1.21, 1.20.6, 1.20.5, 1.20.4, 1.20.3, 1.20.2, 1.20.1, 1.20, 1.19.4, 1.19.3, 1.19.2, 1.19.1, 1.19, 1.18.2
+        game_versions: 26.1.1, 26.1, 1.21.11, 1.21.10, 1.21.9, 1.21.8, 1.21.7, 1.21.6, 1.21.5, 1.21.4, 1.21.3, 1.21.2, 1.21.1, 1.21, 1.20.6, 1.20.5, 1.20.4, 1.20.3, 1.20.2, 1.20.1, 1.20, 1.19.4, 1.19.3, 1.19.2, 1.19.1, 1.19, 1.18.2
         version_type: ${{ steps.parse-release-type.outputs.release_type }}
         loaders: bukkit, spigot, paper, purpur
         dependencies: ${{ inputs.modrinth_dependencies }}
@@ -121,7 +121,7 @@ jobs:
         changelog: ${{ steps.release-artifact.outputs.body }}
         changelog_type: markdown
         display_name: ${{ steps.release-info.outputs.tag_name }}
-        game_versions: 1.21.11, 1.21.10, 1.21.9, 1.21.8, 1.21.7, 1.21.6, 1.21.5, 1.21.4, 1.21.3, 1.21.2, 1.21.1, 1.21, 1.20.6, 1.20.5, 1.20.4, 1.20.3, 1.20.2, 1.20.1, 1.20, 1.19.4, 1.19.3, 1.19.2, 1.19.1, 1.19, 1.18.2
+        game_versions: 26.1.1, 26.1, 1.21.11, 1.21.10, 1.21.9, 1.21.8, 1.21.7, 1.21.6, 1.21.5, 1.21.4, 1.21.3, 1.21.2, 1.21.1, 1.21, 1.20.6, 1.20.5, 1.20.4, 1.20.3, 1.20.2, 1.20.1, 1.20, 1.19.4, 1.19.3, 1.19.2, 1.19.1, 1.19, 1.18.2
         release_type: ${{ steps.parse-release-type.outputs.release_type }}
         project_relations: ${{ inputs.dbo_project_relations }}
         file_path: ${{ github.workspace }}/${{ inputs.plugin_name }}-${{ steps.release-info.outputs.tag_name }}.jar
@@ -136,5 +136,5 @@ jobs:
         channel: ${{ steps.parse-release-type.outputs.release_type }}
         files: '[{"path": "${{ github.workspace }}/${{ inputs.plugin_name }}-${{ steps.release-info.outputs.tag_name }}.jar", "platforms": ["PAPER"]}]'
         description: ${{ steps.release-artifact.outputs.body }}
-        platform_dependencies: '{"PAPER": ["1.18.2-1.21.11"]}'
+        platform_dependencies: '{"PAPER": ["1.18.2-26.1.1"]}'
         plugin_dependencies: ${{ inputs.hangar_plugin_dependencies }}
diff --git a/src/main/java/org/mvplugins/multiverse/core/utils/compatibility/BukkitCompatibility.java b/src/main/java/org/mvplugins/multiverse/core/utils/compatibility/BukkitCompatibility.java
new file mode 100644
index 000000000..f81d22e54
--- /dev/null
+++ b/src/main/java/org/mvplugins/multiverse/core/utils/compatibility/BukkitCompatibility.java
@@ -0,0 +1,68 @@
+package org.mvplugins.multiverse.core.utils.compatibility;
+
+import io.vavr.control.Option;
+import org.bukkit.Bukkit;
+import org.bukkit.NamespacedKey;
+import org.bukkit.Server;
+import org.bukkit.World;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+import org.mvplugins.multiverse.core.utils.ReflectHelper;
+
+import java.lang.reflect.Method;
+import java.nio.file.Path;
+
+/**
+ * Compatibility class used to handle API changes in {@link Bukkit} class.
+ */
+@ApiStatus.AvailableSince("5.6")
+public final class BukkitCompatibility {
+
+    private static final Option<Method> GET_LEVEL_DIRECTORY_METHOD;
+    private static final Option<Method> GET_WORLD_NAMESPACED_KEY_METHOD;
+
+    static {
+        GET_LEVEL_DIRECTORY_METHOD = Option.of(ReflectHelper.getMethod(Server.class, "getLevelDirectory"));
+        GET_WORLD_NAMESPACED_KEY_METHOD = Option.of(ReflectHelper.getMethod(Bukkit.class, "getWorld", NamespacedKey.class));
+    }
+
+    /**
+     * Gets the folder where all the worlds will be store. Before 26.1, all worlds are stored in the root directory
+     * of the server, which can be obtained by {@link Server#getWorldContainer()}.
+     * <br />
+     * After 26.1, PaperMC changed all worlds are stored in the "[level]/dimensions/minecraft" folder under the world
+     * level directory, which needs to be manually parsed.
+     *
+     * @return The location where all the worlds folders should be, depending on server's mc version.
+     */
+    @ApiStatus.AvailableSince("5.6")
+    @NotNull
+    public static Path getWorldFoldersDirectory() {
+        Server server = Bukkit.getServer();
+        return GET_LEVEL_DIRECTORY_METHOD.map(method -> ReflectHelper.invokeMethod(server, method))
+                .filter(Path.class::isInstance)
+                .map(Path.class::cast)
+                .map(path -> path.resolve("dimensions/minecraft"))
+                .getOrElse(() -> server.getWorldContainer().toPath());
+    }
+
+    /**
+     * Check if the world with the given name or namespaced key (e.g. minecraft:overworld) exists,
+     * and return it if it does.
+     * <br />
+     * Note that some default world names have different namespaced key matched with them.
+     * E.g.: world -> minecraft:overworld, world_nether -> minecraft:the_nether, world_the_end -> minecraft:the_end.
+     *
+     * @param nameOrKey Either a name or namespaced key string representation.
+     * @return The world if it exists
+     */
+    @ApiStatus.AvailableSince("5.6")
+    @NotNull
+    public static Option<World> getWorldByNameOrKey(@NotNull String nameOrKey) {
+        return Option.of(Bukkit.getWorld(nameOrKey))
+                .orElse(() -> GET_WORLD_NAMESPACED_KEY_METHOD
+                        .map(method -> ReflectHelper.invokeMethod(null, method, NamespacedKey.fromString(nameOrKey)))
+                        .filter(World.class::isInstance)
+                        .map(World.class::cast));
+    }
+}
diff --git a/src/main/java/org/mvplugins/multiverse/core/utils/compatibility/package-info.java b/src/main/java/org/mvplugins/multiverse/core/utils/compatibility/package-info.java
new file mode 100644
index 000000000..b2212b3ff
--- /dev/null
+++ b/src/main/java/org/mvplugins/multiverse/core/utils/compatibility/package-info.java
@@ -0,0 +1,5 @@
+/**
+ * Contains classes to handle compatibility due to differing API methods across different server versions and the
+ * API gaps between PaperMC and Spigot.
+ */
+package org.mvplugins.multiverse.core.utils.compatibility;
\ No newline at end of file
diff --git a/src/main/java/org/mvplugins/multiverse/core/world/WorldManager.java b/src/main/java/org/mvplugins/multiverse/core/world/WorldManager.java
index 74779d66e..55af6c7c9 100644
--- a/src/main/java/org/mvplugins/multiverse/core/world/WorldManager.java
+++ b/src/main/java/org/mvplugins/multiverse/core/world/WorldManager.java
@@ -49,6 +49,7 @@
 import org.mvplugins.multiverse.core.utils.CaseInsensitiveStringMap;
 import org.mvplugins.multiverse.core.utils.ReflectHelper;
 import org.mvplugins.multiverse.core.utils.ServerProperties;
+import org.mvplugins.multiverse.core.utils.compatibility.BukkitCompatibility;
 import org.mvplugins.multiverse.core.utils.result.Attempt;
 import org.mvplugins.multiverse.core.utils.result.FailureReason;
 import org.mvplugins.multiverse.core.utils.FileUtils;
@@ -699,6 +700,7 @@ private Attempt<String, DeleteFailureReason> doDeleteWorld(@NotNull LoadedMultiv
     private Attempt<File, DeleteFailureReason> validateWorldToDelete(
             @NotNull LoadedMultiverseWorld world) {
         return world.getBukkitWorld().map(World::getWorldFolder)
+                .peek(folder -> Logging.finer("World folder for world %s is at: %s", world.getName(), folder.getPath()))
                 .filter(worldNameChecker::isValidWorldFolder)
                 .map(this::<File, DeleteFailureReason>worldActionResult)
                 .getOrElse(() -> {
@@ -761,7 +763,7 @@ private Attempt<CloneWorldOptions, CloneFailureReason> cloneWorldCopyFolder(@Not
             options.world().getBukkitWorld().peek(this::saveWorldWithFlush);
         }
         File worldFolder = options.world().getBukkitWorld().map(World::getWorldFolder).get();
-        File newWorldFolder = new File(Bukkit.getWorldContainer(), options.newWorldName());
+        File newWorldFolder = BukkitCompatibility.getWorldFoldersDirectory().resolve(options.newWorldName()).toFile();
         return fileUtils.copyFolder(worldFolder, newWorldFolder, CLONE_IGNORE_FILES).fold(
                 exception -> worldActionResult(CloneFailureReason.COPY_FAILED,
                         options.world().getName(), exception),
@@ -947,12 +949,12 @@ private void throwUnloadException(World world) throws MultiverseWorldException {
      * @return A list of all potential worlds.
      */
     public List<String> getPotentialWorlds() {
-        File[] files = Bukkit.getWorldContainer().listFiles();
+        File[] files = BukkitCompatibility.getWorldFoldersDirectory().toFile().listFiles();
         if (files == null) {
             return Collections.emptyList();
         }
         return Arrays.stream(files)
-                .filter(file -> !isWorld(file.getName()))
+                .filter(file -> BukkitCompatibility.getWorldByNameOrKey(file.getName()).isEmpty())
                 .filter(worldNameChecker::isValidWorldFolder)
                 .map(File::getName)
                 .toList();
diff --git a/src/main/java/org/mvplugins/multiverse/core/world/helpers/WorldNameChecker.java b/src/main/java/org/mvplugins/multiverse/core/world/helpers/WorldNameChecker.java
index 33a4125f2..4bb264c20 100644
--- a/src/main/java/org/mvplugins/multiverse/core/world/helpers/WorldNameChecker.java
+++ b/src/main/java/org/mvplugins/multiverse/core/world/helpers/WorldNameChecker.java
@@ -1,15 +1,17 @@
 package org.mvplugins.multiverse.core.world.helpers;
 
 import java.io.File;
+import java.util.List;
 import java.util.Locale;
 import java.util.Set;
 
+import com.dumptruckman.minecraft.util.Logging;
 import io.vavr.control.Option;
-import org.bukkit.Bukkit;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jvnet.hk2.annotations.Service;
 import org.mvplugins.multiverse.core.utils.REPatterns;
+import org.mvplugins.multiverse.core.utils.compatibility.BukkitCompatibility;
 
 /**
  * <p>Utility class in helping to check the status of a world name and it's associated world folder.</p>
@@ -29,6 +31,18 @@ public final class WorldNameChecker {
             "plugins",
             "versions");
 
+    private static final List<WorldFolderSchema> WORLD_FOLDER_SCHEMA = List.of(
+            // OLD
+            WorldFolderSchema.file("level.dat"),
+            WorldFolderSchema.folder("DIM1"),
+            WorldFolderSchema.folder("DIM-1"),
+            // NEW
+            WorldFolderSchema.file("paper-world.yml"),
+            WorldFolderSchema.folder("data"),
+            WorldFolderSchema.folder("entities"),
+            WorldFolderSchema.folder("poi"),
+            WorldFolderSchema.folder("region"));
+
     /**
      * Checks if a world name is valid.
      *
@@ -105,7 +119,8 @@ public FolderStatus checkFolder(@Nullable String worldName) {
         if (worldName == null) {
             return FolderStatus.DOES_NOT_EXIST;
         }
-        File worldFolder = new File(Bukkit.getWorldContainer(), worldName);
+        File worldFolder = BukkitCompatibility.getWorldFoldersDirectory().resolve(worldName).toFile();
+        Logging.finer("Checking valid folder for world '%s' at: '%s'", worldName, worldFolder.getPath());
         return checkFolder(worldFolder);
     }
 
@@ -120,7 +135,7 @@ public FolderStatus checkFolder(@Nullable File worldFolder) {
         if (worldFolder == null || !worldFolder.exists() || !worldFolder.isDirectory()) {
             return FolderStatus.DOES_NOT_EXIST;
         }
-        if (!folderHasDat(worldFolder)) {
+        if (!folderWorldSchemaCheck(worldFolder)) {
             return FolderStatus.NOT_A_WORLD;
         }
         return FolderStatus.VALID;
@@ -133,9 +148,54 @@ public FolderStatus checkFolder(@Nullable File worldFolder) {
      * @param worldFolder   The File that may be a world.
      * @return True if it looks like a world, else false.
      */
-    private boolean folderHasDat(@NotNull File worldFolder) {
-        File[] files = worldFolder.listFiles((file, name) -> name.toLowerCase(Locale.ENGLISH).endsWith(".dat"));
-        return files != null && files.length > 0;
+    private boolean folderWorldSchemaCheck(@NotNull File worldFolder) {
+        return WORLD_FOLDER_SCHEMA.stream()
+                .filter(schema -> schema.check(worldFolder))
+                .count() >= 2;
+    }
+
+    /**
+     * Helper class to check if a file or folder exist.
+     */
+    private interface WorldFolderSchema {
+
+        static WorldFolderSchema file(String path) {
+            return new WorldFile(path);
+        }
+
+        static WorldFolderSchema folder(String path) {
+            return new WorldFolder(path);
+        }
+
+        boolean check(File worldFolder);
+
+        final class WorldFile implements WorldFolderSchema {
+            private final String path;
+
+            private WorldFile(String path) {
+                this.path = path;
+            }
+
+            @Override
+            public boolean check(File worldFolder) {
+                File thisFolder = worldFolder.toPath().resolve(path).toFile();
+                return thisFolder.exists() && thisFolder.isFile();
+            }
+        }
+
+        final class WorldFolder implements WorldFolderSchema {
+            private final String path;
+
+            private WorldFolder(String path) {
+                this.path = path;
+            }
+
+            @Override
+            public boolean check(File worldFolder) {
+                File thisFolder = worldFolder.toPath().resolve(path).toFile();
+                return thisFolder.exists() && thisFolder.isDirectory();
+            }
+        }
     }
 
     /**
diff --git a/src/test/java/org/mvplugins/multiverse/core/mock/MVServerMock.java b/src/test/java/org/mvplugins/multiverse/core/mock/MVServerMock.java
index 1ed0cb32c..0073ce785 100644
--- a/src/test/java/org/mvplugins/multiverse/core/mock/MVServerMock.java
+++ b/src/test/java/org/mvplugins/multiverse/core/mock/MVServerMock.java
@@ -39,6 +39,8 @@ public World createWorld(@NotNull WorldCreator creator) {
         world.getWorldFolder().mkdirs();
         createFile(new File(world.getWorldFolder(), "uid.dat"));
         createFile(new File(world.getWorldFolder(), "level.dat"));
+        new File(world.getWorldFolder(), "region").mkdir();
+        new File(world.getWorldFolder(), "data").mkdir();
         addWorld(world);
         return world;
     }
diff --git a/src/test/java/org/mvplugins/multiverse/core/world/WorldManagerTest.kt b/src/test/java/org/mvplugins/multiverse/core/world/WorldManagerTest.kt
index a6fcd63b6..36bf4efe5 100644
--- a/src/test/java/org/mvplugins/multiverse/core/world/WorldManagerTest.kt
+++ b/src/test/java/org/mvplugins/multiverse/core/world/WorldManagerTest.kt
@@ -7,7 +7,15 @@ import org.hamcrest.MatcherAssert.assertThat
 import org.mockbukkit.mockbukkit.matcher.plugin.PluginManagerFiredEventClassMatcher.hasFiredEventInstance
 import org.mockbukkit.mockbukkit.matcher.plugin.PluginManagerFiredEventClassMatcher.hasNotFiredEventInstance
 import org.mvplugins.multiverse.core.TestWithMockBukkit
-import org.mvplugins.multiverse.core.event.world.*
+import org.mvplugins.multiverse.core.event.world.MVWorldClonedEvent
+import org.mvplugins.multiverse.core.event.world.MVWorldCreatedEvent
+import org.mvplugins.multiverse.core.event.world.MVWorldDeleteEvent
+import org.mvplugins.multiverse.core.event.world.MVWorldImportedEvent
+import org.mvplugins.multiverse.core.event.world.MVWorldLoadedEvent
+import org.mvplugins.multiverse.core.event.world.MVWorldPropertyChangedEvent
+import org.mvplugins.multiverse.core.event.world.MVWorldRegeneratedEvent
+import org.mvplugins.multiverse.core.event.world.MVWorldRemovedEvent
+import org.mvplugins.multiverse.core.event.world.MVWorldUnloadedEvent
 import org.mvplugins.multiverse.core.world.options.CloneWorldOptions
 import org.mvplugins.multiverse.core.world.options.CreateWorldOptions
 import org.mvplugins.multiverse.core.world.options.DeleteWorldOptions
@@ -190,6 +198,8 @@ class WorldManagerTest : TestWithMockBukkit() {
     fun `Load world failed - world folder exists but not imported`() {
         File(Bukkit.getWorldContainer(), "worldfolder").mkdir()
         File(Bukkit.getWorldContainer(), "worldfolder/level.dat").createNewFile()
+        File(Bukkit.getWorldContainer(), "worldfolder/data").mkdir()
+        File(Bukkit.getWorldContainer(), "worldfolder/region").mkdir()
         assertEquals(
             LoadFailureReason.WORLD_EXIST_FOLDER,
             worldManager.loadWorld("worldfolder").failureReason
@@ -270,8 +280,10 @@ class WorldManagerTest : TestWithMockBukkit() {
     fun `Get potential worlds`() {
         File(Bukkit.getWorldContainer(), "newworld1").mkdir()
         File(Bukkit.getWorldContainer(), "newworld1/level.dat").createNewFile()
+        File(Bukkit.getWorldContainer(), "newworld1/data").mkdir()
         File(Bukkit.getWorldContainer(), "newworld2").mkdir()
         File(Bukkit.getWorldContainer(), "newworld2/level.dat").createNewFile()
+        File(Bukkit.getWorldContainer(), "newworld2/data").mkdir()
         assertEquals(setOf("newworld1", "newworld2"), worldManager.getPotentialWorlds().toSet())
     }
 
diff --git a/src/test/java/org/mvplugins/multiverse/core/world/WorldNameCheckerTest.kt b/src/test/java/org/mvplugins/multiverse/core/world/WorldNameCheckerTest.kt
index 88782c0fa..3c586e04e 100644
--- a/src/test/java/org/mvplugins/multiverse/core/world/WorldNameCheckerTest.kt
+++ b/src/test/java/org/mvplugins/multiverse/core/world/WorldNameCheckerTest.kt
@@ -45,6 +45,15 @@ class WorldNameCheckerTest : TestWithMockBukkit() {
     fun `Valid world folder`() {
         File(Bukkit.getWorldContainer(), "test").mkdir()
         File(Bukkit.getWorldContainer(), "test/level.dat").createNewFile()
+        File(Bukkit.getWorldContainer(), "test/data").mkdir()
+        assertEquals(WorldNameChecker.FolderStatus.VALID, worldNameChecker.checkFolder("test"))
+    }
+
+    @Test
+    fun `Valid world folder v26-1 format`() {
+        File(Bukkit.getWorldContainer(), "test").mkdir()
+        File(Bukkit.getWorldContainer(), "test/region").mkdir()
+        File(Bukkit.getWorldContainer(), "test/data").mkdir()
         assertEquals(WorldNameChecker.FolderStatus.VALID, worldNameChecker.checkFolder("test"))
     }