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

/**** 
* Classes
****/ 
// Block obstacle
var Block = Container.expand(function () {
	var self = Container.call(this);
	var blockGfx = self.attachAsset('block', {
		anchorX: 0.5,
		anchorY: 1
	});
	self.width = blockGfx.width;
	self.height = blockGfx.height;
	self.type = 'block';
	self.update = function () {
		self.x -= obstacleSpeed;
	};
	return self;
});
// Player Cube
var Cube = Container.expand(function () {
	var self = Container.call(this);
	var cubeGfx = self.attachAsset('cube', {
		anchorX: 0.5,
		anchorY: 1
	});
	self.width = cubeGfx.width;
	self.height = cubeGfx.height;
	self.velY = 0;
	self.isOnGround = false;
	// Jump method
	self.jump = function () {
		if (self.isOnGround) {
			self.velY = -36; // Increased jump velocity for higher jump
			self.isOnGround = false;
		}
	};
	// Update method
	self.update = function () {
		// Gravity
		self.velY += 2.1; // Slightly increased gravity to balance higher jump arc
		if (self.velY > 60) self.velY = 60;
		self.y += self.velY;
		// Check for landing on top of a block
		self.isOnGround = false;
		for (var i = 0; i < obstacles.length; ++i) {
			var obs = obstacles[i];
			if (obs.type === 'block') {
				// Check if cube is falling and feet are just above the block, and horizontally overlapping
				var cubeBottom = self.y;
				var prevCubeBottom = self.y - self.velY;
				var blockTop = obs.y - obs.height;
				var blockLeft = obs.x - obs.width / 2;
				var blockRight = obs.x + obs.width / 2;
				var cubeLeft = self.x - self.width / 2;
				var cubeRight = self.x + self.width / 2;
				if (self.velY >= 0 && prevCubeBottom <= blockTop && cubeBottom >= blockTop && cubeRight > blockLeft && cubeLeft < blockRight) {
					self.y = blockTop;
					self.velY = 0;
					self.isOnGround = true;
					break;
				}
			}
		}
		// Prevent falling below ground
		if (self.y > groundY) {
			self.y = groundY;
			self.velY = 0;
			self.isOnGround = true;
		}
	};
	return self;
});
// Minicoin collectible
var Minicoin = Container.expand(function () {
	var self = Container.call(this);
	var coinGfx = self.attachAsset('minicoin', {
		anchorX: 0.5,
		anchorY: 1
	});
	self.width = coinGfx.width;
	self.height = coinGfx.height;
	self.type = 'minicoin';
	self.collected = false;
	self.update = function () {
		self.x -= obstacleSpeed;
	};
	return self;
});
// Spike obstacle
var Spike = Container.expand(function () {
	var self = Container.call(this);
	var spikeGfx = self.attachAsset('spike', {
		anchorX: 0.5,
		anchorY: 1
	});
	self.width = spikeGfx.width;
	self.height = spikeGfx.height;
	self.type = 'spike';
	self.update = function () {
		self.x -= obstacleSpeed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0xf0f0f0
});

/**** 
* Game Code
****/ 
// Block obstacle
// Spike obstacle
// Ground
// Cube player
// Constants
var groundHeight = 80;
var groundY = 2732 - groundHeight;
var startX = 400;
var startY = groundY;
var obstacleSpeed = 12;
var minObstacleGap = 420;
var maxObstacleGap = 700;
var lastObstacleX = 0;
var score = 0;
var gameStarted = false;
// Arrays
var obstacles = [];
// Add background
var background = LK.getAsset('background', {
	anchorX: 0,
	anchorY: 0
});
background.x = 0;
background.y = 0;
game.addChild(background);
// Add ground
var ground = LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0
});
ground.x = 0;
ground.y = groundY;
game.addChild(ground);
// Add player cube
var cube = new Cube();
cube.x = startX;
cube.y = startY;
game.addChild(cube);
// Score text
var scoreTxt = new Text2('0', {
	size: 120,
	fill: 0x222222
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Helper: spawn obstacle
function spawnObstacle() {
	// Randomly choose spike or block structure
	var type = Math.random() < 0.6 ? 'spike' : 'block';
	if (type === 'spike') {
		var obs = new Spike();
		obs.x = 2048 + 100;
		obs.y = groundY;
		obstacles.push(obs);
		game.addChild(obs);
		lastObstacleX = obs.x;
	} else {
		// Structure: always 1 block high for passable platforms
		var platformHeight = 1;
		var platformLength = Math.floor(Math.random() * 3) + 2; // 2 to 4 blocks long
		var baseX = 2048 + 100;
		var blockW = 120;
		var blockH = 120;
		var minicoinsOnTop = Math.random() < 0.8; // 80% chance to spawn coins
		for (var i = 0; i < platformLength; ++i) {
			// Only one block high
			var block = new Block();
			block.x = baseX + i * blockW;
			block.y = groundY - 0 * blockH;
			obstacles.push(block);
			game.addChild(block);
			lastObstacleX = block.x;
			// Place minicoins on top of the structure
			if (minicoinsOnTop) {
				var coin = new Minicoin();
				coin.x = baseX + i * blockW;
				coin.y = groundY - blockH - 10; // 10px above top block
				obstacles.push(coin);
				game.addChild(coin);
			}
		}
		// Place a single spike on a random block in the structure
		if (platformLength > 1) {
			var spikeIndex = Math.floor(Math.random() * platformLength);
			var spike = new Spike();
			spike.x = baseX + spikeIndex * blockW;
			spike.y = groundY;
			obstacles.push(spike);
			game.addChild(spike);
		}
	}
}
// Helper: reset game state
function resetGame() {
	// Remove obstacles
	for (var i = 0; i < obstacles.length; ++i) {
		obstacles[i].destroy();
	}
	obstacles.length = 0;
	cube.x = startX;
	cube.y = startY;
	cube.velY = 0;
	cube.isOnGround = true;
	lastObstacleX = 1200;
	score = 0;
	scoreTxt.setText(score);
	gameStarted = false;
}
// Start game on first tap
game.down = function (x, y, obj) {
	if (!gameStarted) {
		gameStarted = true;
		return;
	}
	cube.jump();
};
// Main update loop
game.update = function () {
	if (!gameStarted) return;
	// Update player
	cube.update();
	// Update obstacles
	for (var i = obstacles.length - 1; i >= 0; --i) {
		var obs = obstacles[i];
		obs.update();
		// Remove if off screen
		if (obs.x < -200) {
			obs.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Collision detection
		if (obs.type === 'minicoin') {
			if (!obs.collected && cube.intersects(obs)) {
				obs.collected = true;
				score += 5; // Minicoin gives 5 points
				scoreTxt.setText(score);
				obs.destroy();
				obstacles.splice(i, 1);
				continue;
			}
		} else {
			if (cube.intersects(obs)) {
				// Flash screen and game over
				LK.effects.flashScreen(0xff0000, 800);
				LK.showGameOver();
				return;
			}
			// Score: passed obstacle
			if (!obs.passed && obs.x + obs.width / 2 < cube.x - cube.width / 2) {
				obs.passed = true;
				score += 1;
				scoreTxt.setText(score);
			}
		}
	}
	// Spawn new obstacles
	if (obstacles.length === 0 || 2048 - lastObstacleX > minObstacleGap + Math.random() * (maxObstacleGap - minObstacleGap)) {
		spawnObstacle();
	}
};
// Reset game on game over
LK.on('gameover', function () {
	resetGame();
});
// Initial state
resetGame();
// Play music asset when the game starts
LK.playMusic('Mad');

===================================================================
--- original.js
+++ change.js
@@ -282,5 +282,7 @@
 LK.on('gameover', function () {
 	resetGame();
 });
 // Initial state
-resetGame();
\ No newline at end of file
+resetGame();
+// Play music asset when the game starts
+LK.playMusic('Mad');
\ No newline at end of file