var Finger = Container.expand(function () {
	var self = Container.call(this);
	var fingerGraphics = self.createAsset('finger', 'Finger', .5, .5);
});
var Ball = Container.expand(function () {
	var self = Container.call(this);
	var ballGraphics = self.createAsset('ball', 'Soccer Ball', .5, .5);
	self.velocityY = 0;
	self.gravity = 0.5;
	self.bounceFactor = 0.7;
	self.move = function () {
		self.y += self.velocityY;
		self.velocityY += self.gravity;
		if (self.y > 2732 - self.height / 2) {
			self.velocityY *= -self.bounceFactor;
			self.y = 2732 - self.height / 2;
		}
	};
	self.bounce = function () {
		self.velocityY = -20;
	};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	stage.on('move', function (obj) {
		var pos = obj.event.getLocalPosition(self);
		finger.x = pos.x;
		finger.y = pos.y;
	});
	var ball = self.addChild(new Ball());
	ball.x = 2048 / 2;
	ball.y = 2732 / 2;
	var finger = self.addChild(new Finger());
	finger.visible = true;
	var scoreTxt = new Text2('0', {
		size: 150,
		fill: "#ffffff"
	});
	scoreTxt.anchor.set(.5, 0);
	LK.gui.topCenter.addChild(scoreTxt);
	var isGameOver = false;
	var isGameStarted = false;
	stage.on('down', function (obj) {
		var pos = obj.event.getLocalPosition(self);
		finger.x = pos.x;
		finger.y = pos.y;
		finger.visible = true;
		if (!isGameStarted) {
			ball.bounce();
			isGameStarted = true;
		} else if (ball.intersects(finger)) {
			ball.bounce();
			scoreTxt.setText(parseInt(scoreTxt.text) + 1);
		}
	});
	LK.on('tick', function () {
		ball.move();
		if (ball.y > 2732 - ball.height / 2) {
			isGameOver = true;
		}
		if (isGameOver) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	});
});

===================================================================
--- original.js
+++ change.js
@@ -21,22 +21,16 @@
 	};
 });
 var Game = Container.expand(function () {
 	var self = Container.call(this);
-	stage.on('down', function (obj) {
+	stage.on('move', function (obj) {
 		var pos = obj.event.getLocalPosition(self);
 		finger.x = pos.x;
 		finger.y = pos.y;
-		finger.visible = true;
-		if (ball.intersects(finger)) {
-			ball.bounce();
-			scoreTxt.setText(parseInt(scoreTxt.text) + 1);
-		}
 	});
 	var ball = self.addChild(new Ball());
 	ball.x = 2048 / 2;
 	ball.y = 2732 / 2;
-	ball.velocityY = -20;
 	var finger = self.addChild(new Finger());
 	finger.visible = true;
 	var scoreTxt = new Text2('0', {
 		size: 150,
@@ -44,15 +38,19 @@
 	});
 	scoreTxt.anchor.set(.5, 0);
 	LK.gui.topCenter.addChild(scoreTxt);
 	var isGameOver = false;
+	var isGameStarted = false;
 	stage.on('down', function (obj) {
 		var pos = obj.event.getLocalPosition(self);
 		finger.x = pos.x;
 		finger.y = pos.y;
 		finger.visible = true;
-		if (ball.intersects(finger)) {
+		if (!isGameStarted) {
 			ball.bounce();
+			isGameStarted = true;
+		} else if (ball.intersects(finger)) {
+			ball.bounce();
 			scoreTxt.setText(parseInt(scoreTxt.text) + 1);
 		}
 	});
 	LK.on('tick', function () {