diff --git a/src/main/java/com/github/ptom76/tutorialfabricmod/client/TutorialFabricClientMod.java b/src/main/java/com/github/ptom76/tutorialfabricmod/client/TutorialFabricClientMod.java
index 386140d..9ea645b 100644
--- a/src/main/java/com/github/ptom76/tutorialfabricmod/client/TutorialFabricClientMod.java
+++ b/src/main/java/com/github/ptom76/tutorialfabricmod/client/TutorialFabricClientMod.java
@@ -2,9 +2,18 @@
 
 import com.github.ptom76.tutorialfabricmod.client.render.entity.EntityRenderers;
 import com.github.ptom76.tutorialfabricmod.client.screen.Screens;
+import com.github.ptom76.tutorialfabricmod.mixin.GridWidgetAccessor;
 import net.fabricmc.api.ClientModInitializer;
 import net.fabricmc.api.EnvType;
 import net.fabricmc.api.Environment;
+import net.fabricmc.fabric.api.client.screen.v1.ScreenEvents;
+import net.minecraft.client.gui.screen.GameMenuScreen;
+import net.minecraft.client.gui.widget.ButtonWidget;
+import net.minecraft.client.gui.widget.ClickableWidget;
+import net.minecraft.client.gui.widget.GridWidget;
+import net.minecraft.text.Text;
+
+import java.util.List;
 
 @Environment(EnvType.CLIENT)
 public class TutorialFabricClientMod implements ClientModInitializer {
@@ -19,5 +28,20 @@ public void onInitializeClient() {
 
         // キーバインドの登録
         KeyBindings.init();
+
+
+        ScreenEvents.AFTER_INIT.register((client, screen, scaledWidth, scaledHeight) -> {
+            if (!(screen instanceof GameMenuScreen)) return;
+            ClickableWidget gridWidget = net.fabricmc.fabric.api.client.screen.v1.Screens.getButtons(screen).get(0);
+            if (gridWidget instanceof GridWidget) {
+                List<ClickableWidget> widgets = ((GridWidgetAccessor)gridWidget).getChildren();
+
+                ButtonWidget helloWorldBtn = ButtonWidget.builder(Text.of("Hello, World!"), (widget) -> {
+                    if (client.player != null)
+                        client.player.sendMessage(Text.of("Hello, World!"));
+                }).dimensions(screen.width / 2 - 102, screen.height / 4 + 128, 204, 20).build();
+                widgets.add(helloWorldBtn);
+            }
+        });
     }
 }
diff --git a/src/main/java/com/github/ptom76/tutorialfabricmod/mixin/GridWidgetAccessor.java b/src/main/java/com/github/ptom76/tutorialfabricmod/mixin/GridWidgetAccessor.java
new file mode 100644
index 0000000..8e4d32b
--- /dev/null
+++ b/src/main/java/com/github/ptom76/tutorialfabricmod/mixin/GridWidgetAccessor.java
@@ -0,0 +1,14 @@
+package com.github.ptom76.tutorialfabricmod.mixin;
+
+import net.minecraft.client.gui.widget.ClickableWidget;
+import net.minecraft.client.gui.widget.GridWidget;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+import java.util.List;
+
+@Mixin(GridWidget.class)
+public interface GridWidgetAccessor {
+    @Accessor
+    List<ClickableWidget> getChildren();
+}
diff --git a/src/main/resources/tutorialfabricmod.mixins.json b/src/main/resources/tutorialfabricmod.mixins.json
index fb0b1b2..33b3f74 100644
--- a/src/main/resources/tutorialfabricmod.mixins.json
+++ b/src/main/resources/tutorialfabricmod.mixins.json
@@ -8,6 +8,7 @@
     "StuffTimer"
   ],
   "client": [
+    "GridWidgetAccessor"
   ],
   "injectors": {
     "defaultRequire": 1