===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,185 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+var Bird = Container.expand(function () {
+	var self = Container.call(this);
+	var birdGraphics = self.attachAsset('bird', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.velocityY = 0;
+	self.gravity = 0.6;
+	self.jumpPower = -15;
+	self.maxFallSpeed = 20;
+	self.jump = function () {
+		self.velocityY = self.jumpPower;
+		LK.getSound('jump').play();
+	};
+	self.update = function () {
+		self.velocityY += self.gravity;
+		if (self.velocityY > self.maxFallSpeed) {
+			self.velocityY = self.maxFallSpeed;
+		}
+		self.y += self.velocityY;
+		var rotation = Math.min(self.velocityY * 0.05, 0.5);
+		birdGraphics.rotation = rotation;
+	};
+	return self;
+});
+var Pipe = Container.expand(function () {
+	var self = Container.call(this);
+	self.speed = -8;
+	self.gapHeight = 200;
+	self.pipeWidth = 150;
+	self.scored = false;
+	var topPipe = self.attachAsset('pipeTop', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	var bottomPipe = self.attachAsset('pipeBottom', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.setPipeGap = function (gapY) {
+		var topPipeHeight = gapY - self.gapHeight / 2;
+		var bottomPipeY = gapY + self.gapHeight / 2;
+		var bottomPipeHeight = 2732 - bottomPipeY;
+		topPipe.height = Math.max(100, topPipeHeight);
+		topPipe.y = topPipe.height / 2;
+		bottomPipe.height = Math.max(100, bottomPipeHeight);
+		bottomPipe.y = bottomPipeY + bottomPipe.height / 2;
+	};
+	self.update = function () {
+		self.x += self.speed;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x87CEEB
+});
+
+/**** 
+* Game Code
+****/ 
+var bird;
+var pipes = [];
+var gameStarted = false;
+var gameOver = false;
+var score = 0;
+var pipeSpawnTimer = 0;
+var pipeSpawnInterval = 120;
+var difficultyTimer = 0;
+var backgroundGraphic = LK.getAsset('background', {
+	anchorX: 0,
+	anchorY: 0
+});
+game.addChild(backgroundGraphic);
+var groundGraphic = game.addChild(LK.getAsset('ground', {
+	anchorX: 0,
+	anchorY: 0
+}));
+groundGraphic.y = 2732 - 100;
+var scoreTxt = new Text2('0', {
+	size: 100,
+	fill: 0xFFFFFF
+});
+scoreTxt.anchor.set(0.5, 0);
+scoreTxt.setText('0');
+LK.gui.top.addChild(scoreTxt);
+var startTxt = new Text2('Tap to Start', {
+	size: 80,
+	fill: 0xFFFFFF
+});
+startTxt.anchor.set(0.5, 0.5);
+startTxt.x = 1024;
+startTxt.y = 1366;
+game.addChild(startTxt);
+function initGame() {
+	bird = game.addChild(new Bird());
+	bird.x = 300;
+	bird.y = 1366;
+	bird.velocityY = 0;
+	gameStarted = true;
+	gameOver = false;
+	score = 0;
+	pipes = [];
+	pipeSpawnTimer = 0;
+	difficultyTimer = 0;
+	scoreTxt.setText('0');
+	startTxt.visible = false;
+	LK.playMusic('bgmusic', {
+		loop: true
+	});
+}
+function spawnPipe() {
+	var minGapY = 300;
+	var maxGapY = 2200;
+	var gapY = minGapY + Math.random() * (maxGapY - minGapY);
+	var pipe = game.addChild(new Pipe());
+	pipe.x = 2048 + 100;
+	pipe.y = 0;
+	pipe.setPipeGap(gapY);
+	pipes.push(pipe);
+}
+game.down = function (x, y, obj) {
+	if (!gameStarted) {
+		initGame();
+	} else if (!gameOver && bird) {
+		bird.jump();
+	}
+};
+game.update = function () {
+	if (!gameStarted) {
+		return;
+	}
+	if (gameOver) {
+		return;
+	}
+	if (bird) {
+		bird.update();
+		if (bird.y - 25 < 0 || bird.y + 25 > 2732 - 100) {
+			gameOver = true;
+			LK.getSound('collision').play();
+			LK.showGameOver();
+			return;
+		}
+	}
+	pipeSpawnTimer++;
+	if (pipeSpawnTimer >= pipeSpawnInterval) {
+		spawnPipe();
+		pipeSpawnTimer = 0;
+	}
+	difficultyTimer++;
+	if (difficultyTimer > 0 && difficultyTimer % 600 === 0) {
+		pipeSpawnInterval = Math.max(90, pipeSpawnInterval - 5);
+	}
+	for (var i = pipes.length - 1; i >= 0; i--) {
+		var pipe = pipes[i];
+		pipe.update();
+		if (bird && bird.intersects(pipe)) {
+			gameOver = true;
+			LK.getSound('collision').play();
+			LK.showGameOver();
+			return;
+		}
+		if (bird && !pipe.scored && bird.x > pipe.x) {
+			pipe.scored = true;
+			score++;
+			LK.setScore(score);
+			scoreTxt.setText(String(score));
+		}
+		if (pipe.x < -200) {
+			pipe.destroy();
+			pipes.splice(i, 1);
+		}
+	}
+};
\ No newline at end of file