===================================================================
--- original.js
+++ change.js
@@ -15,8 +15,9 @@
 			var jumpHeight = 330;
 			var jumpSpeed = 10;
 			var jumpTick = 0;
 			var rotationSpeed = 0.1;
+			var score = 0;
 			var jumpingInterval = LK.setInterval(function () {
 				if (jumpTick < jumpHeight) {
 					self.y -= jumpSpeed;
 					jumpTick += jumpSpeed;
@@ -28,10 +29,10 @@
 				if (self.y >= 2000) {
 					self.y = 2000;
 					self.rotation = 0;
 					LK.clearInterval(jumpingInterval);
-					self.parent.score++;
-					scoreTxt.setText(self.parent.score.toString());
+					this.score++;
+					scoreTxt.setText(this.score.toString());
 				}
 			}, 21);
 		}
 	};
@@ -41,9 +42,9 @@
 	LK.stageContainer.setBackgroundColor(0xADD8E6);
 	var player = self.addChild(new Player());
 	player.x = 200;
 	player.y = 2000;
-	self.score = 0;
+	var score = 0;
 	var groundGraphics = self.createAsset('ground', 'Ground Graphics', 0, 1);
 	groundGraphics.width = 2048;
 	groundGraphics.height = (2732 - player.y) * 0.8;
 	groundGraphics.y = player.y + groundGraphics.height / 2 + groundGraphics.height * 0.4 + 100;