diff --git a/BauSystem/BauSystem_Main/src/de/steamwar/bausystem/features/TestCommand.java b/BauSystem/BauSystem_Main/src/de/steamwar/bausystem/features/TestCommand.java
deleted file mode 100644
index 2aa35725..00000000
--- a/BauSystem/BauSystem_Main/src/de/steamwar/bausystem/features/TestCommand.java
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
- *   This file is a part of the SteamWar software.
- *
- *   Copyright (C) 2026 SteamWar.de-Serverteam
- *
- *   This program is free software: you can redistribute it and/or modify
- *   it under the terms of the GNU Affero General Public License as published by
- *   the Free Software Foundation, either version 3 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- *   GNU Affero General Public License for more details.
- *
- *   You should have received a copy of the GNU Affero General Public License
- *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package de.steamwar.bausystem.features;
-
-import de.steamwar.command.SWCommand;
-import de.steamwar.kotlin.ui.TestInv;
-import de.steamwar.linkage.Linked;
-import org.bukkit.entity.Player;
-
-@Linked
-public class TestCommand extends SWCommand {
-    public TestCommand() {
-        super("supertestcommand");
-    }
-
-    @Register
-    public void test(Player player) {
-        TestInv inv = new TestInv(player);
-        inv.open();
-    }
-}
diff --git a/BauSystem/build.gradle.kts b/BauSystem/build.gradle.kts
index f2843bcf..6a6bfac5 100644
--- a/BauSystem/build.gradle.kts
+++ b/BauSystem/build.gradle.kts
@@ -39,5 +39,4 @@ tasks.register<DevServer>("DevBau21") {
     dependsOn(":SchematicSystem:shadowJar")
     dependsOn(":KotlinCore:shadowJar")
     template = "Bau21"
-    worldName = "73"
 }
diff --git a/KotlinCore/src/de/steamwar/kotlin/ui/TestInv.kt b/KotlinCore/src/de/steamwar/kotlin/ui/TestInv.kt
deleted file mode 100644
index f4e12f26..00000000
--- a/KotlinCore/src/de/steamwar/kotlin/ui/TestInv.kt
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- *   This file is a part of the SteamWar software.
- *
- *   Copyright (C) 2026 SteamWar.de-Serverteam
- *
- *   This program is free software: you can redistribute it and/or modify
- *   it under the terms of the GNU Affero General Public License as published by
- *   the Free Software Foundation, either version 3 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- *   GNU Affero General Public License for more details.
- *
- *   You should have received a copy of the GNU Affero General Public License
- *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package de.steamwar.kotlin.ui
-
-import de.steamwar.kotlin.ui.components.item
-import org.bukkit.Material
-import org.bukkit.entity.Player
-import org.bukkit.inventory.ItemStack
-
-class TestInv(player: Player): UIInventory(player) {
-
-    override fun view() {
-        inventory(3, title = "TEST_TITLE") {
-            group {
-                item {
-                    var test by Test.test.listen()
-
-                    x = test % 9
-                    y = 1
-                    item = ItemStack.of(Material.STONE, test)
-
-                    onClick {
-                        test++
-                    }
-                }
-            }
-        }
-    }
-}
-
-object Test {
-    val test = Observer(1)
-}
diff --git a/KotlinCore/src/de/steamwar/kotlin/ui/UIWindow.kt b/KotlinCore/src/de/steamwar/kotlin/ui/UIWindow.kt
index e9398689..87eead32 100644
--- a/KotlinCore/src/de/steamwar/kotlin/ui/UIWindow.kt
+++ b/KotlinCore/src/de/steamwar/kotlin/ui/UIWindow.kt
@@ -70,9 +70,8 @@ class UIWindow(val player: Player, val render: WindowContext.() -> Unit): Invent
 
         @EventHandler
         fun onInventoryClick(event: InventoryClickEvent) {
-            if (event.inventory.holder is UIWindow) {
-                val window = event.inventory.holder as UIWindow
-
+            val window = event.inventory.holder
+            if (window is UIWindow) {
                 event.isCancelled = true
 
                 if (window.context.skipDoubleClick && event.click == ClickType.DOUBLE_CLICK) return
@@ -82,9 +81,8 @@ class UIWindow(val player: Player, val render: WindowContext.() -> Unit): Invent
 
         @EventHandler
         fun onInventoryClose(event: InventoryCloseEvent) {
-            if (event.inventory.holder is UIWindow) {
-                val window = event.inventory.holder as UIWindow
-
+            val window = event.inventory.holder
+            if (window is UIWindow) {
                 window.onClose()
             }
         }
diff --git a/KotlinCore/src/de/steamwar/kotlin/util/ItemUtils.kt b/KotlinCore/src/de/steamwar/kotlin/util/ItemUtils.kt
index d504c679..7f709c64 100644
--- a/KotlinCore/src/de/steamwar/kotlin/util/ItemUtils.kt
+++ b/KotlinCore/src/de/steamwar/kotlin/util/ItemUtils.kt
@@ -48,5 +48,3 @@ fun ItemStack.hideAttributes() = apply { itemMeta = itemMeta.also { it.addItemFl
 fun ItemStack.enchanted() = apply { itemMeta = itemMeta.also { it.addEnchant(Enchantment.UNBREAKING, 10, true) } }
 
 fun ItemStack.customModelData(model: CustomModelDataComponent) = apply { itemMeta = itemMeta.also { it.setCustomModelDataComponent(model) } }
-
-