===================================================================
--- original.js
+++ change.js
@@ -1,11 +1,7 @@
 /**** 
 * Classes
 ****/ 
-/** 
-* Bird class represents the main character in the game.
-* It has properties for speed, gravity, lift and methods for flapping, updating and flipping.
-*/ 
 var Bird = Container.expand(function () {
 	var self = Container.call(this);
 	var birdGraphics = self.attachAsset('bird', {
 		anchorX: 0.5,
@@ -14,19 +10,12 @@
 	self.xSpeed = 10.9375;
 	self.ySpeed = -20;
 	self.gravity = 1;
 	self.lift = -15;
-	birdGraphics.alpha = 1;
-	/** 
-	* Flap method increases the bird's ySpeed by the lift amount.
-	*/ 
 	self.flap = function () {
 		self.ySpeed = self.lift * 1.5;
 	};
-	/** 
-	* Update method updates the bird's position and rotation based on its speed and gravity.
-	*/ 
-	self.update = function () {
+	self._update_migrated = function () {
 		if (game.isMouseDown) {
 			self.ySpeed += self.gravity / 3;
 		} else {
 			self.ySpeed += self.gravity;
@@ -38,19 +27,12 @@
 		}
 		var targetRotation = Math.atan2(self.ySpeed, self.xSpeed * self.scale.x) / 2;
 		birdGraphics.rotation += (targetRotation - birdGraphics.rotation) / 10;
 	};
-	/** 
-	* Flip method flips the bird's direction by multiplying its scale by -1.
-	*/ 
 	self.flip = function () {
 		self.scale.x *= -1;
 	};
 });
-/** 
-* Obstacle class represents the obstacles in the game.
-* It has properties for speed and a method for moving.
-*/ 
 var Obstacle = Container.expand(function () {
 	var self = Container.call(this);
 	var obstacleShadow = self.attachAsset('obstacleShadow', {
 		anchorX: 0.5,
@@ -68,18 +50,12 @@
 		anchorY: 0.5
 	});
 	obstacleGraphics.rotation = Math.PI / 4;
 	self.speed = 5;
-	/** 
-	* Move method updates the obstacle's position based on the given speed.
-	*/ 
-	self.move = function (speed) {
+	self._move_migrated = function (speed) {
 		self.y += speed;
 	};
 });
-/** 
-* Wall class represents the walls in the game.
-*/ 
 var Wall = Container.expand(function () {
 	var self = Container.call(this);
 	var wallGraphics = self.attachAsset('wall', {
 		anchorX: 0.5,
@@ -125,9 +101,9 @@
 game.obstacleSpeed = 5;
 game.obstacleSpeedIncrease = 0.005;
 game.checkObstacleCollision = function (obstacles) {
 	for (var i = 0; i < obstacles.length; i++) {
-		obstacles[i].move();
+		obstacles[i]._move_migrated();
 		var dist = Math.sqrt(Math.pow(bird.x - obstacles[i].x, 2) + Math.pow(bird.y - obstacles[i].y, 2));
 		if (dist < 280) {
 			LK.setScore(game.score);
 			LK.showGameOver();
@@ -173,17 +149,17 @@
 var rightObstacleSpawnTime = Math.floor(Math.random() * obstacleSpawnRandomness) + obstacleSpawnRandomness;
 bird.x = 1024;
 bird.y = 1366;
 game.isMouseDown = false;
-game.on('down', function (obj) {
+game.on('down', function (x, y, obj) {
 	bird.flap();
 	game.isMouseDown = true;
 });
-game.on('up', function (obj) {
+game.on('up', function (x, y, obj) {
 	game.isMouseDown = false;
 });
 LK.on('tick', function () {
-	bird.update();
+	bird._update_migrated();
 	if (game.score > 2) {
 		tutorialText.y += 5;
 		tutorialTextWhite.y += 5;
 	}
@@ -214,16 +190,16 @@
 		game.score++;
 		LK.setScore(game.score);
 	}
 	for (var i = leftObstacles.length - 1; i >= 0; i--) {
-		leftObstacles[i].move(game.obstacleSpeed);
+		leftObstacles[i]._move_migrated(game.obstacleSpeed);
 		if (leftObstacles[i].y > 3232) {
 			leftObstacles[i].destroy();
 			leftObstacles.splice(i, 1);
 		}
 	}
 	for (var i = rightObstacles.length - 1; i >= 0; i--) {
-		rightObstacles[i].move(game.obstacleSpeed);
+		rightObstacles[i]._move_migrated(game.obstacleSpeed);
 		if (rightObstacles[i].y > 3232) {
 			rightObstacles[i].destroy();
 			rightObstacles.splice(i, 1);
 		}