diff --git a/android/src/com/relurori/breakout/MainPanel.java b/android/src/com/relurori/breakout/MainPanel.java
index 5897759..9e81320 100644
--- a/android/src/com/relurori/breakout/MainPanel.java
+++ b/android/src/com/relurori/breakout/MainPanel.java
@@ -20,6 +20,7 @@
 import com.relurori.engine.graphics.shapes.meta.Collision;
 import com.relurori.engine.graphics.shapes.meta.Intersection;
 import com.relurori.engine.io.Joystick;
+import com.relurori.engine.main.Gameboard;
 import com.relurori.engine.main.MainThread;
 import com.relurori.engine.network.NetworkThread;
 
@@ -43,7 +44,7 @@
 import android.view.SurfaceView;
 import android.view.View;
 
-public class MainPanel extends SurfaceView implements SurfaceHolder.Callback {
+public class MainPanel extends SurfaceView implements SurfaceHolder.Callback, Gameboard {
 
 	private static final String TAG = MainPanel.class.getSimpleName();
 
diff --git a/android/src/com/relurori/engine/main/Gameboard.java b/android/src/com/relurori/engine/main/Gameboard.java
new file mode 100644
index 0000000..2a1ed24
--- /dev/null
+++ b/android/src/com/relurori/engine/main/Gameboard.java
@@ -0,0 +1,5 @@
+package com.relurori.engine.main;
+
+public interface Gameboard {
+	public void updatePhysics();
+}