/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdSprite = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocityY = 0;
	self.gravity = 0.8;
	self.flapStrength = -12;
	self.isDead = false;
	self.lastY = 0;
	self.flap = function () {
		if (!self.isDead) {
			self.velocityY = self.flapStrength;
			LK.getSound('flap').play();
		}
	};
	self.update = function () {
		if (!self.isDead) {
			self.lastY = self.y;
			self.velocityY += self.gravity;
			self.y += self.velocityY;
			// Rotate bird based on velocity
			birdSprite.rotation = Math.max(-0.5, Math.min(0.5, self.velocityY * 0.1));
			// Check ground collision
			if (self.y > groundY - 40) {
				self.y = groundY - 40;
				self.die();
			}
			// Check ceiling collision
			if (self.y < 40) {
				self.y = 40;
				self.velocityY = 0;
			}
		}
	};
	self.die = function () {
		if (!self.isDead) {
			self.isDead = true;
			LK.getSound('hit').play();
			LK.setTimeout(function () {
				LK.showGameOver();
			}, 1000);
		}
	};
	return self;
});
var Pipe = Container.expand(function (pipeX, gapY) {
	var self = Container.call(this);
	var topPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0.0,
		y: 0,
		height: gapY - 200
	});
	var bottomPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0.0,
		y: gapY + 200,
		height: 2732 - (gapY + 200)
	});
	self.x = pipeX;
	self.speed = -4;
	self.scored = false;
	self.lastX = pipeX;
	self.update = function () {
		self.lastX = self.x;
		self.x += self.speed;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// Game variables
var bird;
var pipes = [];
var groundY = 2632;
var pipeSpawnTimer = 0;
var pipeSpawnInterval = 180;
var gameStarted = false;
// Create ground
var ground = game.addChild(LK.getAsset('ground', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 1024,
	y: groundY + 50
}));
// Create bird
bird = new Bird();
bird.x = 300;
bird.y = 1366;
game.addChild(bird);
// Create score display
var scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
scoreTxt.y = 100;
LK.gui.top.addChild(scoreTxt);
// Create instructions
var instructionTxt = new Text2('Tap to flap!', {
	size: 60,
	fill: 0xFFFFFF
});
instructionTxt.anchor.set(0.5, 0);
instructionTxt.y = 300;
LK.gui.top.addChild(instructionTxt);
function spawnPipe() {
	var gapY = 800 + Math.random() * 1200;
	var pipe = new Pipe(2200, gapY);
	pipes.push(pipe);
	game.addChild(pipe);
}
function checkCollisions() {
	if (bird.isDead) return;
	for (var i = 0; i < pipes.length; i++) {
		var pipe = pipes[i];
		// Check if bird passes through pipe gap for scoring
		if (!pipe.scored && pipe.lastX > bird.x && pipe.x <= bird.x) {
			pipe.scored = true;
			LK.setScore(LK.getScore() + 1);
			scoreTxt.setText(LK.getScore().toString());
			LK.getSound('score').play();
		}
		// Check collision with pipes
		if (bird.x + 30 > pipe.x - 80 && bird.x - 30 < pipe.x + 80) {
			// Check top pipe collision (pipe.children[0].y is bottom of top pipe)
			if (bird.y - 30 < pipe.children[0].y) {
				bird.die();
				return;
			}
			// Check bottom pipe collision (pipe.children[1].y is top of bottom pipe)
			if (bird.y + 30 > pipe.children[1].y) {
				bird.die();
				return;
			}
		}
	}
}
function cleanupPipes() {
	for (var i = pipes.length - 1; i >= 0; i--) {
		if (pipes[i].x < -200) {
			pipes[i].destroy();
			pipes.splice(i, 1);
		}
	}
}
game.down = function (x, y, obj) {
	if (!gameStarted) {
		gameStarted = true;
		instructionTxt.alpha = 0;
	}
	bird.flap();
};
game.update = function () {
	if (!gameStarted) return;
	// Spawn pipes
	pipeSpawnTimer++;
	if (pipeSpawnTimer >= pipeSpawnInterval) {
		spawnPipe();
		pipeSpawnTimer = 0;
	}
	// Check collisions and scoring
	checkCollisions();
	// Clean up off-screen pipes
	cleanupPipes();
};

===================================================================
--- original.js
+++ change.js
@@ -56,15 +56,17 @@
 var Pipe = Container.expand(function (pipeX, gapY) {
 	var self = Container.call(this);
 	var topPipe = self.attachAsset('pipe', {
 		anchorX: 0.5,
-		anchorY: 1.0,
-		y: gapY - 200
+		anchorY: 0.0,
+		y: 0,
+		height: gapY - 200
 	});
 	var bottomPipe = self.attachAsset('pipe', {
 		anchorX: 0.5,
 		anchorY: 0.0,
-		y: gapY + 200
+		y: gapY + 200,
+		height: 2732 - (gapY + 200)
 	});
 	self.x = pipeX;
 	self.speed = -4;
 	self.scored = false;