diff --git a/nicko-core/src/main/java/net/artelnatif/nicko/command/NickoCommand.java b/nicko-core/src/main/java/net/artelnatif/nicko/command/NickoCommand.java
index 4f24e42..87fbb45 100644
--- a/nicko-core/src/main/java/net/artelnatif/nicko/command/NickoCommand.java
+++ b/nicko-core/src/main/java/net/artelnatif/nicko/command/NickoCommand.java
@@ -5,16 +5,19 @@ import net.artelnatif.nicko.command.sub.NickoCheckSubCmd;
 import net.artelnatif.nicko.command.sub.NickoDebugSubCmd;
 import net.artelnatif.nicko.command.sub.NickoDisguiseSubCmd;
 import net.artelnatif.nicko.command.sub.NickoGUISubCmd;
+import net.artelnatif.nicko.gui.MainGUI;
 import org.bukkit.ChatColor;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.ConsoleCommandSender;
+import org.bukkit.entity.Player;
 
 public class NickoCommand implements CommandExecutor {
     private final String opPrefix = "§c(OP)";
     private String helpMessage = """
             §cNicko §8§o[{version}] §f- §2Help:
+            §6/nicko §f- §7Open the GUI.
             §6/nicko disguise §f- §7Change your appearance.
             §6/nicko revert §f- §7Revert your appearance to your default skin and name.
             §6/nicko help §f- §7Prints this help message.
@@ -36,7 +39,13 @@ public class NickoCommand implements CommandExecutor {
                 default -> sendHelpMessages(sender);
             }
         } else {
-            sendHelpMessages(sender);
+            if (sender instanceof Player player) {
+                new MainGUI(player).open();
+                return false;
+            }
+
+            sender.sendMessage("The GUI can only be opened in-game.");
+            return false;
         }
 
         return false;
diff --git a/nicko-core/src/main/java/net/artelnatif/nicko/gui/MainGUI.java b/nicko-core/src/main/java/net/artelnatif/nicko/gui/MainGUI.java
new file mode 100644
index 0000000..4feb502
--- /dev/null
+++ b/nicko-core/src/main/java/net/artelnatif/nicko/gui/MainGUI.java
@@ -0,0 +1,45 @@
+package net.artelnatif.nicko.gui;
+
+import de.studiocode.invui.gui.GUI;
+import de.studiocode.invui.gui.builder.GUIBuilder;
+import de.studiocode.invui.gui.builder.guitype.GUIType;
+import de.studiocode.invui.gui.structure.Structure;
+import de.studiocode.invui.item.builder.ItemBuilder;
+import de.studiocode.invui.item.impl.SimpleItem;
+import de.studiocode.invui.window.impl.single.SimpleWindow;
+import net.artelnatif.nicko.gui.items.*;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+
+public class MainGUI {
+    private final Player player;
+    private final GUI gui;
+    private String[] structureIngredients = new String[]{"# # # # # # # # #",
+            "# % % % % % % % #",
+            "# % # # B # # % #",
+            "# % # N A S # % #",
+            "# % % % % % % % #",
+            "E # # # # # # # #"};
+
+    public MainGUI(Player player) {
+        if (!player.hasPermission("nicko.admin") || !player.isOp()) {
+            structureIngredients[3] = structureIngredients[3].replace("A", "#");
+        }
+
+        this.gui = new GUIBuilder<>(GUIType.NORMAL)
+                .setStructure(new Structure(structureIngredients))
+                .addIngredient('#', new SimpleItem(new ItemBuilder(Material.BLACK_STAINED_GLASS_PANE)))
+                .addIngredient('%', new SimpleItem(new ItemBuilder(Material.ORANGE_STAINED_GLASS_PANE)))
+                .addIngredient('E', new ExitDoorItem())
+                .addIngredient('N', new ChangeNameItem())
+                .addIngredient('S', new ChangeSkinItem())
+                .addIngredient('A', new AdminPanelAccessItem())
+                .addIngredient('B', new ChangeNameAndSkinItem())
+                .build();
+        this.player = player;
+    }
+
+    public void open() {
+        new SimpleWindow(player, "Nicko", gui).show();
+    }
+}
diff --git a/nicko-core/src/main/java/net/artelnatif/nicko/gui/items/AdminPanelAccessItem.java b/nicko-core/src/main/java/net/artelnatif/nicko/gui/items/AdminPanelAccessItem.java
new file mode 100644
index 0000000..d756363
--- /dev/null
+++ b/nicko-core/src/main/java/net/artelnatif/nicko/gui/items/AdminPanelAccessItem.java
@@ -0,0 +1,26 @@
+package net.artelnatif.nicko.gui.items;
+
+import de.studiocode.invui.item.ItemProvider;
+import de.studiocode.invui.item.builder.ItemBuilder;
+import de.studiocode.invui.item.impl.BaseItem;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.event.inventory.ClickType;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.jetbrains.annotations.NotNull;
+
+public class AdminPanelAccessItem extends BaseItem {
+    @Override
+    public ItemProvider getItemProvider() {
+        final ItemBuilder builder = new ItemBuilder(Material.PISTON);
+        builder.setDisplayName("§cAdministration panel");
+        builder.addLoreLines("§7Access the administration panel.");
+        return builder;
+    }
+
+    @Override
+    public void handleClick(@NotNull ClickType clickType, @NotNull Player player, @NotNull InventoryClickEvent event) {
+        if (clickType.isLeftClick() || clickType.isRightClick()) {
+        }
+    }
+}
diff --git a/nicko-core/src/main/java/net/artelnatif/nicko/gui/items/ChangeNameAndSkinItem.java b/nicko-core/src/main/java/net/artelnatif/nicko/gui/items/ChangeNameAndSkinItem.java
new file mode 100644
index 0000000..453fa15
--- /dev/null
+++ b/nicko-core/src/main/java/net/artelnatif/nicko/gui/items/ChangeNameAndSkinItem.java
@@ -0,0 +1,30 @@
+package net.artelnatif.nicko.gui.items;
+
+import de.studiocode.invui.item.ItemProvider;
+import de.studiocode.invui.item.builder.ItemBuilder;
+import de.studiocode.invui.item.impl.BaseItem;
+import net.artelnatif.nicko.anvil.AnvilManager;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.event.inventory.ClickType;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.jetbrains.annotations.NotNull;
+
+public class ChangeNameAndSkinItem extends BaseItem {
+    @Override
+    public ItemProvider getItemProvider() {
+        final ItemBuilder builder = new ItemBuilder(Material.WRITABLE_BOOK);
+        builder.setDisplayName("§6Skin §fand §6name §fchange");
+        builder.addLoreLines("§7Change both your skin and name.");
+        return builder;
+    }
+
+    @Override
+    public void handleClick(@NotNull ClickType clickType, @NotNull Player player, @NotNull InventoryClickEvent event) {
+        if (clickType.isLeftClick() || clickType.isRightClick()) {
+            event.getView().close();
+            final AnvilManager manager = new AnvilManager(player);
+            manager.openNameAndSkinAnvil();
+        }
+    }
+}
diff --git a/nicko-core/src/main/java/net/artelnatif/nicko/gui/items/ChangeNameItem.java b/nicko-core/src/main/java/net/artelnatif/nicko/gui/items/ChangeNameItem.java
new file mode 100644
index 0000000..56cc5ec
--- /dev/null
+++ b/nicko-core/src/main/java/net/artelnatif/nicko/gui/items/ChangeNameItem.java
@@ -0,0 +1,30 @@
+package net.artelnatif.nicko.gui.items;
+
+import de.studiocode.invui.item.ItemProvider;
+import de.studiocode.invui.item.builder.ItemBuilder;
+import de.studiocode.invui.item.impl.BaseItem;
+import net.artelnatif.nicko.anvil.AnvilManager;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.event.inventory.ClickType;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.jetbrains.annotations.NotNull;
+
+public class ChangeNameItem extends BaseItem {
+    @Override
+    public ItemProvider getItemProvider() {
+        final ItemBuilder builder = new ItemBuilder(Material.NAME_TAG);
+        builder.setDisplayName("§6Name §fchange");
+        builder.addLoreLines("§7Only change your name.");
+        return builder;
+    }
+
+    @Override
+    public void handleClick(@NotNull ClickType clickType, @NotNull Player player, @NotNull InventoryClickEvent event) {
+        if (clickType.isLeftClick() || clickType.isRightClick()) {
+            event.getView().close();
+            final AnvilManager manager = new AnvilManager(player);
+            manager.openNameAnvil();
+        }
+    }
+}
diff --git a/nicko-core/src/main/java/net/artelnatif/nicko/gui/items/ChangeSkinItem.java b/nicko-core/src/main/java/net/artelnatif/nicko/gui/items/ChangeSkinItem.java
new file mode 100644
index 0000000..78febbc
--- /dev/null
+++ b/nicko-core/src/main/java/net/artelnatif/nicko/gui/items/ChangeSkinItem.java
@@ -0,0 +1,30 @@
+package net.artelnatif.nicko.gui.items;
+
+import de.studiocode.invui.item.ItemProvider;
+import de.studiocode.invui.item.builder.ItemBuilder;
+import de.studiocode.invui.item.impl.BaseItem;
+import net.artelnatif.nicko.anvil.AnvilManager;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.event.inventory.ClickType;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.jetbrains.annotations.NotNull;
+
+public class ChangeSkinItem extends BaseItem {
+    @Override
+    public ItemProvider getItemProvider() {
+        final ItemBuilder builder = new ItemBuilder(Material.PAINTING);
+        builder.setDisplayName("§6Skin §fchange");
+        builder.addLoreLines("§7Only change your skin.");
+        return builder;
+    }
+
+    @Override
+    public void handleClick(@NotNull ClickType clickType, @NotNull Player player, @NotNull InventoryClickEvent event) {
+        if(clickType.isLeftClick() || clickType.isRightClick()) {
+            event.getView().close();
+            final AnvilManager manager = new AnvilManager(player);
+            manager.openSkinAnvil();
+        }
+    }
+}
diff --git a/nicko-core/src/main/java/net/artelnatif/nicko/gui/items/ExitDoorItem.java b/nicko-core/src/main/java/net/artelnatif/nicko/gui/items/ExitDoorItem.java
new file mode 100644
index 0000000..c1cedfc
--- /dev/null
+++ b/nicko-core/src/main/java/net/artelnatif/nicko/gui/items/ExitDoorItem.java
@@ -0,0 +1,24 @@
+package net.artelnatif.nicko.gui.items;
+
+import de.studiocode.invui.item.ItemProvider;
+import de.studiocode.invui.item.builder.ItemBuilder;
+import de.studiocode.invui.item.impl.BaseItem;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.event.inventory.ClickType;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.jetbrains.annotations.NotNull;
+
+public class ExitDoorItem extends BaseItem {
+    @Override
+    public ItemProvider getItemProvider() {
+        return new ItemBuilder(Material.OAK_DOOR).setDisplayName("§fExit");
+    }
+
+    @Override
+    public void handleClick(@NotNull ClickType clickType, @NotNull Player player, @NotNull InventoryClickEvent event) {
+        if (clickType.isLeftClick() || clickType.isRightClick()) {
+            event.getView().close();
+        }
+    }
+}