/**** 
* 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.flapPower = -12;
	self.isAlive = true;
	self.flap = function () {
		self.velocityY = self.flapPower;
		LK.getSound('flap').play();
	};
	self.update = function () {
		if (!self.isAlive) return;
		self.velocityY += self.gravity;
		self.lastY = self.y;
		self.y += self.velocityY;
		if (self.lastY - 25 >= 0 && self.y - 25 < 0) {
			self.isAlive = false;
			LK.showGameOver();
		}
		if (self.y - 25 < 0) {
			self.y = 25;
			self.velocityY = 0;
		}
	};
	return self;
});
var Coin = Container.expand(function () {
	var self = Container.call(this);
	var coinGraphics = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -6;
	self.isCollected = false;
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});
var Ground = Container.expand(function () {
	var self = Container.call(this);
	var groundGraphics = self.attachAsset('ground', {
		anchorX: 0,
		anchorY: 0
	});
	self.x = 0;
	self.y = 2582;
	return self;
});
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	self.speed = -6;
	self.gapSize = 250;
	self.hasBeenScored = false;
	var topPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 1
	});
	var bottomPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0
	});
	self.setup = function (gapY) {
		self.gapY = gapY;
		topPipe.y = gapY - self.gapSize / 2;
		bottomPipe.y = gapY + self.gapSize / 2;
		topPipe.x = 50;
		bottomPipe.x = 50;
	};
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87CEEB
});

/**** 
* Game Code
****/ 
var gameStarted = false;
var menuContainer = new Container();
game.addChild(menuContainer);
var titleTxt = new Text2('FLAPPY BIRD', {
	size: 200,
	fill: 0xFFFFFF
});
titleTxt.anchor.set(0.5, 0.5);
titleTxt.x = 1024;
titleTxt.y = 600;
menuContainer.addChild(titleTxt);
var instructionsTxt = new Text2('TAP TO FLAP', {
	size: 120,
	fill: 0xFFFFFF
});
instructionsTxt.anchor.set(0.5, 0.5);
instructionsTxt.x = 1024;
instructionsTxt.y = 1100;
menuContainer.addChild(instructionsTxt);
var tapToStartTxt = new Text2('TAP TO START', {
	size: 100,
	fill: 0xFFD700
});
tapToStartTxt.anchor.set(0.5, 0.5);
tapToStartTxt.x = 1024;
tapToStartTxt.y = 1500;
menuContainer.addChild(tapToStartTxt);
var bird = game.addChild(new Bird());
bird.x = 300;
bird.y = 1366;
bird.lastY = bird.y;
bird.lastWasCollidingWithPipe = false;
bird.visible = false;
var ground = game.addChild(new Ground());
ground.visible = false;
var pipes = [];
var coins = [];
var pipeSpawnTimer = 0;
var pipeSpawnInterval = 200;
var nextGapPosition = 0;
var currentLevel = 1;
var pipsPassedInLevel = 0;
var pipsRequiredToLevelUp = 5;
var coinsCollected = 0;
var scoreTxt = new Text2('Score: 0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
scoreTxt.y = 20;
LK.gui.top.addChild(scoreTxt);
scoreTxt.visible = false;
var gameScore = 0;
var levelTxt = new Text2('Level 1', {
	size: 100,
	fill: 0xFFFFFF
});
levelTxt.anchor.set(0.5, 0);
levelTxt.y = 150;
LK.gui.top.addChild(levelTxt);
levelTxt.visible = false;
function spawnPipe() {
	var minGapY = 400;
	var maxGapY = 1800;
	var randomGapY = minGapY + Math.random() * (maxGapY - minGapY);
	var newPipe = game.addChild(new Pipe());
	newPipe.x = 2048 + 100;
	var basePipeGapSize = newPipe.gapSize;
	newPipe.gapSize = Math.max(150, basePipeGapSize - (currentLevel - 1) * 15);
	newPipe.setup(randomGapY);
	newPipe.lastX = newPipe.x;
	newPipe.hasBeenScored = false;
	pipes.push(newPipe);
	var coinOffset = (Math.random() - 0.5) * 150;
	var newCoin = game.addChild(new Coin());
	newCoin.x = newPipe.x;
	newCoin.y = randomGapY + coinOffset;
	newCoin.lastX = newCoin.x;
	newCoin.isCollected = false;
	coins.push(newCoin);
}
game.down = function (x, y, obj) {
	if (!gameStarted) {
		gameStarted = true;
		menuContainer.visible = false;
		bird.visible = true;
		ground.visible = true;
		scoreTxt.visible = true;
		levelTxt.visible = true;
		bird.flap();
	} else if (bird.isAlive) {
		bird.flap();
	}
};
game.update = function () {
	if (!gameStarted) return;
	bird.update();
	pipeSpawnTimer++;
	var currentSpawnInterval = Math.max(120, pipeSpawnInterval - (currentLevel - 1) * 15);
	if (pipeSpawnTimer >= currentSpawnInterval) {
		spawnPipe();
		pipeSpawnTimer = 0;
	}
	for (var i = coins.length - 1; i >= 0; i--) {
		var coin = coins[i];
		coin.update();
		if (!coin.lastX) coin.lastX = coin.x;
		if (coin.x < -100) {
			coin.destroy();
			coins.splice(i, 1);
		}
		if (bird.isAlive && !coin.isCollected) {
			var coinCollisionDistance = Math.sqrt((bird.x - coin.x) * (bird.x - coin.x) + (bird.y - coin.y) * (bird.y - coin.y));
			if (coinCollisionDistance < 50) {
				coin.isCollected = true;
				coinsCollected++;
				LK.getSound('coin').play();
				coin.destroy();
				coins.splice(i, 1);
			}
		}
	}
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		pipe.update();
		if (!pipe.lastX) pipe.lastX = pipe.x;
		if (pipe.lastX > 300 && pipe.x <= 300 && !pipe.hasBeenScored) {
			pipe.hasBeenScored = true;
			gameScore++;
			LK.setScore(gameScore);
			pipsPassedInLevel++;
			scoreTxt.setText('Score: ' + gameScore);
			LK.getSound('score').play();
			if (pipsPassedInLevel >= pipsRequiredToLevelUp) {
				currentLevel++;
				pipsPassedInLevel = 0;
				levelTxt.setText('Level ' + currentLevel);
			}
		}
		pipe.lastX = pipe.x;
		if (pipe.x < -150) {
			pipe.destroy();
			pipes.splice(i, 1);
		}
		if (bird.isAlive && bird.lastWasCollidingWithPipe === undefined) {
			bird.lastWasCollidingWithPipe = false;
		}
		if (bird.isAlive) {
			var birdLeft = bird.x - 25;
			var birdRight = bird.x + 25;
			var birdTop = bird.y - 25;
			var birdBottom = bird.y + 25;
			var pipeLeft = pipe.x - 50;
			var pipeRight = pipe.x + 50;
			var isCollidingNow = false;
			if (birdRight > pipeLeft && birdLeft < pipeRight) {
				if (birdTop < pipe.gapY - pipe.gapSize / 2 || birdBottom > pipe.gapY + pipe.gapSize / 2) {
					isCollidingNow = true;
				}
			}
			if (!bird.lastWasCollidingWithPipe && isCollidingNow) {
				bird.isAlive = false;
				LK.showGameOver();
			}
			bird.lastWasCollidingWithPipe = isCollidingNow;
		}
	}
};
LK.playMusic('bgmusic', {
	loop: true
});

===================================================================
--- original.js
+++ change.js
@@ -94,14 +94,43 @@
 
 /**** 
 * Game Code
 ****/ 
+var gameStarted = false;
+var menuContainer = new Container();
+game.addChild(menuContainer);
+var titleTxt = new Text2('FLAPPY BIRD', {
+	size: 200,
+	fill: 0xFFFFFF
+});
+titleTxt.anchor.set(0.5, 0.5);
+titleTxt.x = 1024;
+titleTxt.y = 600;
+menuContainer.addChild(titleTxt);
+var instructionsTxt = new Text2('TAP TO FLAP', {
+	size: 120,
+	fill: 0xFFFFFF
+});
+instructionsTxt.anchor.set(0.5, 0.5);
+instructionsTxt.x = 1024;
+instructionsTxt.y = 1100;
+menuContainer.addChild(instructionsTxt);
+var tapToStartTxt = new Text2('TAP TO START', {
+	size: 100,
+	fill: 0xFFD700
+});
+tapToStartTxt.anchor.set(0.5, 0.5);
+tapToStartTxt.x = 1024;
+tapToStartTxt.y = 1500;
+menuContainer.addChild(tapToStartTxt);
 var bird = game.addChild(new Bird());
 bird.x = 300;
 bird.y = 1366;
 bird.lastY = bird.y;
 bird.lastWasCollidingWithPipe = false;
+bird.visible = false;
 var ground = game.addChild(new Ground());
+ground.visible = false;
 var pipes = [];
 var coins = [];
 var pipeSpawnTimer = 0;
 var pipeSpawnInterval = 200;
@@ -116,16 +145,18 @@
 });
 scoreTxt.anchor.set(0.5, 0);
 scoreTxt.y = 20;
 LK.gui.top.addChild(scoreTxt);
+scoreTxt.visible = false;
 var gameScore = 0;
 var levelTxt = new Text2('Level 1', {
 	size: 100,
 	fill: 0xFFFFFF
 });
 levelTxt.anchor.set(0.5, 0);
 levelTxt.y = 150;
 LK.gui.top.addChild(levelTxt);
+levelTxt.visible = false;
 function spawnPipe() {
 	var minGapY = 400;
 	var maxGapY = 1800;
 	var randomGapY = minGapY + Math.random() * (maxGapY - minGapY);
@@ -145,13 +176,22 @@
 	newCoin.isCollected = false;
 	coins.push(newCoin);
 }
 game.down = function (x, y, obj) {
-	if (bird.isAlive) {
+	if (!gameStarted) {
+		gameStarted = true;
+		menuContainer.visible = false;
+		bird.visible = true;
+		ground.visible = true;
+		scoreTxt.visible = true;
+		levelTxt.visible = true;
 		bird.flap();
+	} else if (bird.isAlive) {
+		bird.flap();
 	}
 };
 game.update = function () {
+	if (!gameStarted) return;
 	bird.update();
 	pipeSpawnTimer++;
 	var currentSpawnInterval = Math.max(120, pipeSpawnInterval - (currentLevel - 1) * 15);
 	if (pipeSpawnTimer >= currentSpawnInterval) {