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

/**** 
* Classes
****/ 
var Cube = Container.expand(function () {
	var self = Container.call(this);
	var cubeGraphics = self.attachAsset('cube', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	var cubeHighlight = self.attachAsset('cubeHighlight', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	cubeHighlight.alpha = 0.3;
	var cubeCore = self.attachAsset('cubeCore', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.velocityY = 0;
	self.gravity = 0.5;
	self.jumpForce = -18;
	self.maxJumpForce = -24;
	self.isGrounded = false;
	self.groundY = 2400;
	self.update = function () {
		// Apply gravity
		self.velocityY += self.gravity;
		self.y += self.velocityY;
		// Rotate cube continuously for visual appeal
		self.rotation += 0.05;
		// Ground collision
		if (self.y >= self.groundY) {
			self.y = self.groundY;
			self.velocityY = 0;
			self.isGrounded = true;
		} else {
			self.isGrounded = false;
		}
	};
	self.jump = function (force) {
		if (self.isGrounded) {
			self.velocityY = force;
			self.isGrounded = false;
			LK.getSound('jump').play();
		}
	};
	return self;
});
var Ground = Container.expand(function () {
	var self = Container.call(this);
	var groundGraphics = self.attachAsset('ground', {
		anchorX: 0,
		anchorY: 0
	});
	var groundPattern = self.attachAsset('groundPattern', {
		anchorX: 0,
		anchorY: 0
	});
	groundPattern.x = 10;
	groundPattern.y = 10;
	self.speed = -5;
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});
var Obstacle = Container.expand(function (type) {
	var self = Container.call(this);
	var obstacleGraphics;
	self.type = type || 'spike';
	self.speed = -5;
	if (self.type === 'spike') {
		obstacleGraphics = self.attachAsset('spike', {
			anchorX: 0.5,
			anchorY: 1.0
		});
		var spikeCore = self.attachAsset('spikeCore', {
			anchorX: 0.5,
			anchorY: 1.0
		});
	} else if (self.type === 'barrier') {
		obstacleGraphics = self.attachAsset('barrier', {
			anchorX: 0.5,
			anchorY: 0.5
		});
		var barrierHighlight = self.attachAsset('barrierHighlight', {
			anchorX: 0.5,
			anchorY: 0.5
		});
	}
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x1e3c72
});

/**** 
* Game Code
****/ 
var cube;
var obstacles = [];
var groundTiles = [];
var isJumping = false;
var jumpStartTime = 0;
var gameSpeed = 5;
var distance = 0;
var obstacleTimer = 0;
var groundTimer = 0;
// Initialize cube
cube = game.addChild(new Cube());
cube.x = 300;
cube.y = 2400;
// Initialize ground tiles
for (var i = 0; i < 15; i++) {
	var groundTile = game.addChild(new Ground());
	groundTile.x = i * 200;
	groundTile.y = 2440;
	groundTiles.push(groundTile);
}
// Score display
var scoreTxt = new Text2('Distance: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
function spawnObstacle() {
	var obstacleType = Math.random() < 0.7 ? 'spike' : 'barrier';
	var obstacle = game.addChild(new Obstacle(obstacleType));
	obstacle.x = 2200;
	if (obstacleType === 'spike') {
		obstacle.y = 2400;
	} else {
		obstacle.y = Math.random() < 0.5 ? 2300 : 2200;
	}
	obstacles.push(obstacle);
}
function spawnGround() {
	var groundTile = game.addChild(new Ground());
	groundTile.x = 2200;
	groundTile.y = 2440;
	groundTiles.push(groundTile);
}
function resetGame() {
	// Reset cube position
	cube.x = 300;
	cube.y = 2400;
	cube.velocityY = 0;
	cube.isGrounded = true;
	// Clear obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		obstacles[i].destroy();
		obstacles.splice(i, 1);
	}
	// Reset ground
	for (var j = groundTiles.length - 1; j >= 0; j--) {
		if (j >= 15) {
			groundTiles[j].destroy();
			groundTiles.splice(j, 1);
		} else {
			groundTiles[j].x = j * 200;
		}
	}
	// Reset game variables
	distance = 0;
	obstacleTimer = 0;
	groundTimer = 0;
	isJumping = false;
	scoreTxt.setText('Distance: 0');
}
game.down = function (x, y, obj) {
	if (!isJumping) {
		isJumping = true;
		jumpStartTime = LK.ticks;
	}
};
game.up = function (x, y, obj) {
	if (isJumping) {
		var holdDuration = LK.ticks - jumpStartTime;
		var jumpForce = cube.jumpForce;
		// Increase jump force based on hold duration (max 30 ticks)
		if (holdDuration > 5) {
			var extraForce = Math.min(holdDuration - 5, 25) * 0.2;
			jumpForce = cube.jumpForce - extraForce;
			jumpForce = Math.max(jumpForce, cube.maxJumpForce);
		}
		cube.jump(jumpForce);
		isJumping = false;
	}
};
game.update = function () {
	// Update distance
	distance += 0.1;
	scoreTxt.setText('Distance: ' + Math.floor(distance));
	// Spawn obstacles
	obstacleTimer++;
	if (obstacleTimer >= 90 + Math.random() * 90) {
		spawnObstacle();
		obstacleTimer = 0;
	}
	// Spawn ground tiles
	groundTimer++;
	if (groundTimer >= 25) {
		spawnGround();
		groundTimer = 0;
	}
	// Update and check obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obstacle = obstacles[i];
		if (obstacle.lastX === undefined) obstacle.lastX = obstacle.x;
		// Remove off-screen obstacles
		if (obstacle.lastX >= -100 && obstacle.x < -100) {
			obstacle.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Check collision with cube
		if (obstacle.intersects(cube)) {
			LK.getSound('death').play();
			LK.effects.flashScreen(0xff0000, 500);
			resetGame();
			return;
		}
		obstacle.lastX = obstacle.x;
	}
	// Update and check ground tiles
	for (var j = groundTiles.length - 1; j >= 0; j--) {
		var ground = groundTiles[j];
		if (ground.lastX === undefined) ground.lastX = ground.x;
		// Remove off-screen ground tiles
		if (ground.lastX >= -200 && ground.x < -200) {
			ground.destroy();
			groundTiles.splice(j, 1);
			continue;
		}
		ground.lastX = ground.x;
	}
	// Increase difficulty over time
	if (Math.floor(distance) % 150 === 0 && Math.floor(distance) > 0) {
		gameSpeed = Math.min(gameSpeed + 0.05, 10);
		// Update speeds for all moving objects
		for (var k = 0; k < obstacles.length; k++) {
			obstacles[k].speed = -gameSpeed;
		}
		for (var l = 0; l < groundTiles.length; l++) {
			groundTiles[l].speed = -gameSpeed;
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -11,8 +11,17 @@
 	var cubeGraphics = self.attachAsset('cube', {
 		anchorX: 0.5,
 		anchorY: 1.0
 	});
+	var cubeHighlight = self.attachAsset('cubeHighlight', {
+		anchorX: 0.5,
+		anchorY: 1.0
+	});
+	cubeHighlight.alpha = 0.3;
+	var cubeCore = self.attachAsset('cubeCore', {
+		anchorX: 0.5,
+		anchorY: 1.0
+	});
 	self.velocityY = 0;
 	self.gravity = 0.5;
 	self.jumpForce = -18;
 	self.maxJumpForce = -24;
@@ -21,8 +30,10 @@
 	self.update = function () {
 		// Apply gravity
 		self.velocityY += self.gravity;
 		self.y += self.velocityY;
+		// Rotate cube continuously for visual appeal
+		self.rotation += 0.05;
 		// Ground collision
 		if (self.y >= self.groundY) {
 			self.y = self.groundY;
 			self.velocityY = 0;
@@ -45,8 +56,14 @@
 	var groundGraphics = self.attachAsset('ground', {
 		anchorX: 0,
 		anchorY: 0
 	});
+	var groundPattern = self.attachAsset('groundPattern', {
+		anchorX: 0,
+		anchorY: 0
+	});
+	groundPattern.x = 10;
+	groundPattern.y = 10;
 	self.speed = -5;
 	self.update = function () {
 		self.x += self.speed;
 	};
@@ -61,13 +78,21 @@
 		obstacleGraphics = self.attachAsset('spike', {
 			anchorX: 0.5,
 			anchorY: 1.0
 		});
+		var spikeCore = self.attachAsset('spikeCore', {
+			anchorX: 0.5,
+			anchorY: 1.0
+		});
 	} else if (self.type === 'barrier') {
 		obstacleGraphics = self.attachAsset('barrier', {
 			anchorX: 0.5,
 			anchorY: 0.5
 		});
+		var barrierHighlight = self.attachAsset('barrierHighlight', {
+			anchorX: 0.5,
+			anchorY: 0.5
+		});
 	}
 	self.update = function () {
 		self.x += self.speed;
 	};
@@ -77,9 +102,9 @@
 /**** 
 * Initialize Game
 ****/ 
 var game = new LK.Game({
-	backgroundColor: 0x87CEEB
+	backgroundColor: 0x1e3c72
 });
 
 /**** 
 * Game Code