/**** 
* 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.velocity = 0;
	self.gravity = 0.8;
	self.flapStrength = -12;
	self.maxFallSpeed = 15;
	self.rotation = 0;
	self.flap = function () {
		self.velocity = self.flapStrength;
		LK.getSound('flap').play();
		// Animate bird rotation for flapping effect
		tween(birdGraphics, {
			rotation: -0.3
		}, {
			duration: 100
		});
		tween(birdGraphics, {
			rotation: 0
		}, {
			duration: 200
		});
	};
	self.update = function () {
		// Apply gravity
		self.velocity += self.gravity;
		// Limit fall speed
		if (self.velocity > self.maxFallSpeed) {
			self.velocity = self.maxFallSpeed;
		}
		// Update position
		self.y += self.velocity;
		// Rotate bird based on velocity
		if (self.velocity > 0) {
			birdGraphics.rotation = Math.min(self.velocity * 0.1, 1.5);
		} else {
			birdGraphics.rotation = Math.max(self.velocity * 0.1, -0.5);
		}
	};
	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 = -4;
	self.collected = false;
	self.update = function () {
		self.x += self.speed;
		// Simple rotation animation
		coinGraphics.rotation += 0.1;
	};
	self.checkCollection = function (bird) {
		var distance = Math.sqrt(Math.pow(bird.x - self.x, 2) + Math.pow(bird.y - self.y, 2));
		return distance < 35; // Collection radius
	};
	return self;
});
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	self.gapHeight = 300;
	self.speed = -4;
	self.scored = false;
	// Create top pipe
	self.topPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 1
	});
	// Create bottom pipe
	self.bottomPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0
	});
	self.setupPipes = function (gapCenterY) {
		self.topPipe.y = gapCenterY - self.gapHeight / 2;
		self.bottomPipe.y = gapCenterY + self.gapHeight / 2;
	};
	self.update = function () {
		self.x += self.speed;
	};
	self.checkCollision = function (bird) {
		var birdBounds = {
			left: bird.x - 30,
			right: bird.x + 30,
			top: bird.y - 30,
			bottom: bird.y + 30
		};
		var pipeBounds = {
			left: self.x - 60,
			right: self.x + 60,
			topBottom: self.topPipe.y,
			bottomTop: self.bottomPipe.y
		};
		// Check if bird is within pipe horizontal bounds
		if (birdBounds.right > pipeBounds.left && birdBounds.left < pipeBounds.right) {
			// Check collision with top or bottom pipe
			if (birdBounds.top < pipeBounds.topBottom || birdBounds.bottom > pipeBounds.bottomTop) {
				return true;
			}
		}
		return false;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
var bird;
var pipes = [];
var coins = [];
var ground;
var gameStarted = false;
var gameActive = true;
var pipeSpawnTimer = 0;
var pipeSpawnInterval = 90; // 1.5 seconds at 60fps
// Create score display
var scoreTxt = new Text2('0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Create start instruction
var startTxt = new Text2('TAP TO START', {
	size: 60,
	fill: 0xFFFFFF
});
startTxt.anchor.set(0.5, 0.5);
startTxt.x = 2048 / 2;
startTxt.y = 2732 / 2 - 200;
game.addChild(startTxt);
// Initialize bird
bird = new Bird();
bird.x = 2048 / 4;
bird.y = 2732 / 2;
game.addChild(bird);
// Create ground
ground = game.attachAsset('ground', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 2732 - 100
});
function spawnPipe() {
	var pipe = new Pipe();
	pipe.x = 2048 + 60;
	// Random gap center position
	var minGapCenter = 200;
	var maxGapCenter = 2732 - 200 - 100; // Account for ground
	var gapCenterY = minGapCenter + Math.random() * (maxGapCenter - minGapCenter);
	pipe.setupPipes(gapCenterY);
	pipes.push(pipe);
	game.addChild(pipe);
	// Spawn coin in the gap center
	var coin = new Coin();
	coin.x = pipe.x;
	coin.y = gapCenterY;
	coins.push(coin);
	game.addChild(coin);
}
function checkScore() {
	for (var i = 0; i < pipes.length; i++) {
		var pipe = pipes[i];
		if (!pipe.scored && pipe.x < bird.x) {
			pipe.scored = true;
			LK.setScore(LK.getScore() + 1);
			scoreTxt.setText(LK.getScore().toString());
			LK.getSound('score').play();
		}
	}
}
function checkCoinCollection() {
	for (var i = coins.length - 1; i >= 0; i--) {
		var coin = coins[i];
		if (!coin.collected && coin.checkCollection(bird)) {
			coin.collected = true;
			LK.setScore(LK.getScore() + 5); // Coins worth 5 points
			scoreTxt.setText(LK.getScore().toString());
			LK.getSound('score').play();
			coin.destroy();
			coins.splice(i, 1);
		}
	}
}
function checkCollisions() {
	// Check pipe collisions
	for (var i = 0; i < pipes.length; i++) {
		if (pipes[i].checkCollision(bird)) {
			return true;
		}
	}
	// Check ground collision
	if (bird.y + 30 > ground.y) {
		return true;
	}
	// Check ceiling collision
	if (bird.y - 30 < 0) {
		return true;
	}
	return false;
}
function gameOver() {
	gameActive = false;
	LK.getSound('hit').play();
	// Stop bird movement
	bird.velocity = 0;
	// Flash screen red
	LK.effects.flashScreen(0xff0000, 1000);
	// Show game over after a brief delay
	LK.setTimeout(function () {
		LK.showGameOver();
	}, 500);
}
// Touch/tap handler
game.down = function (x, y, obj) {
	if (!gameStarted) {
		gameStarted = true;
		gameActive = true;
		startTxt.visible = false;
		// Spawn first pipe
		spawnPipe();
	}
	if (gameActive) {
		bird.flap();
	}
};
// Main game loop
game.update = function () {
	if (!gameStarted || !gameActive) {
		return;
	}
	// Update bird
	bird.update();
	// Update pipes
	for (var i = pipes.length - 1; i >= 0; i--) {
		pipes[i].update();
		// Remove pipes that have moved off screen
		if (pipes[i].x < -120) {
			pipes[i].destroy();
			pipes.splice(i, 1);
		}
	}
	// Update coins
	for (var i = coins.length - 1; i >= 0; i--) {
		coins[i].update();
		// Remove coins that have moved off screen
		if (coins[i].x < -120) {
			coins[i].destroy();
			coins.splice(i, 1);
		}
	}
	// Spawn new pipes
	pipeSpawnTimer++;
	if (pipeSpawnTimer >= pipeSpawnInterval) {
		spawnPipe();
		pipeSpawnTimer = 0;
	}
	// Check for score
	checkScore();
	// Check for coin collection
	checkCoinCollection();
	// Check for collisions
	if (checkCollisions()) {
		gameOver();
	}
};

===================================================================
--- original.js
+++ change.js
@@ -49,8 +49,27 @@
 		}
 	};
 	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 = -4;
+	self.collected = false;
+	self.update = function () {
+		self.x += self.speed;
+		// Simple rotation animation
+		coinGraphics.rotation += 0.1;
+	};
+	self.checkCollection = function (bird) {
+		var distance = Math.sqrt(Math.pow(bird.x - self.x, 2) + Math.pow(bird.y - self.y, 2));
+		return distance < 35; // Collection radius
+	};
+	return self;
+});
 var Pipe = Container.expand(function () {
 	var self = Container.call(this);
 	self.gapHeight = 300;
 	self.speed = -4;
@@ -108,8 +127,9 @@
 * Game Code
 ****/ 
 var bird;
 var pipes = [];
+var coins = [];
 var ground;
 var gameStarted = false;
 var gameActive = true;
 var pipeSpawnTimer = 0;
@@ -151,8 +171,14 @@
 	var gapCenterY = minGapCenter + Math.random() * (maxGapCenter - minGapCenter);
 	pipe.setupPipes(gapCenterY);
 	pipes.push(pipe);
 	game.addChild(pipe);
+	// Spawn coin in the gap center
+	var coin = new Coin();
+	coin.x = pipe.x;
+	coin.y = gapCenterY;
+	coins.push(coin);
+	game.addChild(coin);
 }
 function checkScore() {
 	for (var i = 0; i < pipes.length; i++) {
 		var pipe = pipes[i];
@@ -163,8 +189,21 @@
 			LK.getSound('score').play();
 		}
 	}
 }
+function checkCoinCollection() {
+	for (var i = coins.length - 1; i >= 0; i--) {
+		var coin = coins[i];
+		if (!coin.collected && coin.checkCollection(bird)) {
+			coin.collected = true;
+			LK.setScore(LK.getScore() + 5); // Coins worth 5 points
+			scoreTxt.setText(LK.getScore().toString());
+			LK.getSound('score').play();
+			coin.destroy();
+			coins.splice(i, 1);
+		}
+	}
+}
 function checkCollisions() {
 	// Check pipe collisions
 	for (var i = 0; i < pipes.length; i++) {
 		if (pipes[i].checkCollision(bird)) {
@@ -221,16 +260,27 @@
 			pipes[i].destroy();
 			pipes.splice(i, 1);
 		}
 	}
+	// Update coins
+	for (var i = coins.length - 1; i >= 0; i--) {
+		coins[i].update();
+		// Remove coins that have moved off screen
+		if (coins[i].x < -120) {
+			coins[i].destroy();
+			coins.splice(i, 1);
+		}
+	}
 	// Spawn new pipes
 	pipeSpawnTimer++;
 	if (pipeSpawnTimer >= pipeSpawnInterval) {
 		spawnPipe();
 		pipeSpawnTimer = 0;
 	}
 	// Check for score
 	checkScore();
+	// Check for coin collection
+	checkCoinCollection();
 	// Check for collisions
 	if (checkCollisions()) {
 		gameOver();
 	}