diff --git a/isometric-park-fna/FNAGame.cs b/isometric-park-fna/FNAGame.cs
--- a/isometric-park-fna/FNAGame.cs
+++ b/isometric-park-fna/FNAGame.cs
@@ -30,6 +30,7 @@
 class FNAGame : Game
 {
     private KeyboardState keyboardPrev = new KeyboardState();
+    private MouseState mousePrev = new MouseState();
 
     private SpriteBatch batch;
     private SoundEffect sound;
@@ -448,10 +449,8 @@
 
 
 #if DEBUG
-		if (mouseCur.RightButton == ButtonState.Pressed)
+		if (mouseCur.RightButton == ButtonState.Pressed && mousePrev.RightButton == ButtonState.Released)
         {
-			Vector2 cameraMiddle = this.camera.position + new Vector2(FNAGame.width / 2, FNAGame.height / 2);
-			Vector2 delta = this.camera.position - this.original_point;
 			this.camera.Jump(this.original_point);
         }
 #endif
@@ -495,6 +494,7 @@
 		}
 
 		this.keyboardPrev = keyboardCur;
+		this.mousePrev = mouseCur;
 
 		stopWatch.Stop();
 		this.updateTime = stopWatch.Elapsed;