/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");
var storage = LK.import("@upit/storage.v1", {
	level: 1,
	bestTime: 0
});

/**** 
* Classes
****/ 
var Car = Container.expand(function () {
	var self = Container.call(this);
	var carGraphics = self.attachAsset('playerCar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.update = function () {
		// Player car does not move forward automatically anymore
		// Only horizontal movement is allowed, so no change to self.y here
		if (self.x < 0) {
			self.x = 2048;
		} else if (self.x > 2048) {
			self.x = 0;
		}
	};
	return self;
});
var EnemyCar = Container.expand(function () {
	var self = Container.call(this);
	var enemyCarGraphics = self.attachAsset('enemyCar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.update = function () {
		// Enemy cars move down the screen (already correct)
		self.y += self.speed;
		if (self.x < 0) {
			self.x = 2048;
		} else if (self.x > 2048) {
			self.x = 0;
		}
	};
	return self;
});
var Smoke = Container.expand(function () {
	var self = Container.call(this);
	var smokeGraphics = self.attachAsset('centerCircle', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 0.5,
		scaleY: 0.5
	});
	// Initialize with random properties for varied effect
	self.alpha = 0.7;
	self.speedX = (Math.random() - 0.5) * 2; // Random horizontal drift
	self.speedY = 1 + Math.random() * 2; // Move backward speed
	self.fadeSpeed = 0.02 + Math.random() * 0.04; // Fade out speed
	self.growSpeed = 0.03 + Math.random() * 0.03; // Expansion rate
	// Update smoke particle behavior
	self.update = function () {
		self.x += self.speedX;
		self.y += self.speedY; // Move downward (backward from car perspective)
		self.alpha -= self.fadeSpeed;
		self.scale.x += self.growSpeed;
		self.scale.y += self.growSpeed;
		// Remove smoke when it becomes too transparent
		if (self.alpha <= 0) {
			self.destroy();
			return true; // Signal that this smoke has been destroyed
		}
		return false;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// Create score text
var score = 0;
var scoreTxt = new Text2('Score: 0', {
	size: 100,
	fill: 0xFFFFFF
});
// Add smoke effects
var smokeParticles = [];
function createSmoke(x, y, amount) {
	for (var i = 0; i < amount; i++) {
		var smoke = new Smoke();
		// Alternate between left and right sides of the car
		var side = i % 2 === 0 ? -1 : 1;
		// Position smoke on the left or right side of the car
		smoke.x = x + side * 100 + (Math.random() - 0.5) * 20; // Offset from car sides
		smoke.y = y + 200; // Position behind car (below car in screen coordinates)
		smokeParticles.push(smoke);
		game.addChild(smoke);
	}
}
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var road = LK.getAsset('road', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 1024,
	y: 1366
});
game.addChild(road);
// Play background music with fade in
LK.playMusic('bgmusic', {
	fade: {
		start: 0,
		end: 0.8,
		duration: 1000
	}
});
// Display high score
var highScore = storage.highScore || 0;
var highScoreTxt = new Text2('High Score: ' + highScore, {
	size: 80,
	fill: 0x00a000,
	// Lighter green color
	fontWeight: 'bold' // Make the text bold
});
highScoreTxt.anchor.set(0.5, 0);
highScoreTxt.y = 120;
LK.gui.top.addChild(highScoreTxt);
var playerCar = game.addChild(new Car());
// Place player in left or right lane randomly, not center
playerCar.x = Math.random() > 0.5 ? 512 : 1536; // 512 = left lane, 1536 = right lane
playerCar.y = 2300; // Start near the bottom, adjusted for bigger car
var enemyCars = [];
function spawnEnemyCar() {
	// Only allow enemy cars to spawn in the same vertical lines as the player (left or right lane)
	// Lane Xs: left, right
	var laneXs = [512, 1536];
	// Car height for vertical gap - increased multiplier for more space
	var carHeight = 660;
	var verticalGapMultiplier = 3.5;
	// Find the highest Y of any existing enemy car, or use -330 if none
	var topY = -330;
	for (var i = 0; i < enemyCars.length; i++) {
		if (enemyCars[i].y < topY) {
			topY = enemyCars[i].y;
		}
	}
	// Patterns: only left, only right - never both lanes at the same time
	// to ensure player always has a path to pass through
	var patterns = [
	// Only left lane
	[{
		x: laneXs[0]
	}],
	// Only right lane
	[{
		x: laneXs[1]
	}]];
	// Keep track of which pattern to use next
	if (typeof spawnEnemyCar.patternIndex === "undefined") {
		spawnEnemyCar.patternIndex = 0;
	}
	// Shuffle patterns order every cycle for variety
	if (typeof spawnEnemyCar.patternOrder === "undefined" || spawnEnemyCar.patternOrder.length === 0) {
		var order = [];
		for (var i = 0; i < patterns.length; i++) order.push(i);
		// Fisher-Yates shuffle
		for (var i = order.length - 1; i > 0; i--) {
			var j = Math.floor(Math.random() * (i + 1));
			var temp = order[i];
			order[i] = order[j];
			order[j] = temp;
		}
		spawnEnemyCar.patternOrder = order;
		spawnEnemyCar.patternIndex = 0;
	}
	var patternIdx = spawnEnemyCar.patternOrder[spawnEnemyCar.patternIndex];
	var pattern = patterns[patternIdx];
	spawnEnemyCar.patternIndex++;
	if (spawnEnemyCar.patternIndex >= spawnEnemyCar.patternOrder.length) {
		spawnEnemyCar.patternOrder = [];
	}
	// Place new pattern below the last one, with the specified gap
	var spawnY = topY;
	for (var i = 0; i < pattern.length; i++) {
		var carDef = pattern[i];
		var enemyCar = new EnemyCar();
		enemyCar.x = carDef.x;
		enemyCar.y = spawnY;
		enemyCars.push(enemyCar);
		game.addChild(enemyCar);
		spawnY -= carHeight * verticalGapMultiplier;
	}
}
game.update = function () {
	// No gradual movement needed; handled instantly in game.down
	// Only update playerCar for horizontal movement, not forward movement
	playerCar.update();
	// Create smoke particles behind player car
	if (LK.ticks % 5 == 0) {
		createSmoke(playerCar.x, playerCar.y, 2);
	}
	// Update and manage smoke particles
	for (var i = smokeParticles.length - 1; i >= 0; i--) {
		var isDestroyed = smokeParticles[i].update();
		if (isDestroyed) {
			smokeParticles.splice(i, 1);
		}
	}
	for (var i = enemyCars.length - 1; i >= 0; i--) {
		var enemyCar = enemyCars[i];
		// Track previous position for scoring
		if (enemyCar.lastY === undefined) {
			enemyCar.lastY = enemyCar.y;
			enemyCar.scored = false;
		}
		enemyCar.update();
		// No smoke for enemy cars
		// Score when car passes the player
		if (!enemyCar.scored && enemyCar.lastY < playerCar.y && enemyCar.y >= playerCar.y) {
			score += 10;
			scoreTxt.setText('Score: ' + score);
			enemyCar.scored = true;
		}
		// Update last position
		enemyCar.lastY = enemyCar.y;
		if (enemyCar.y > 2832) {
			// If the enemy car goes off the screen
			enemyCar.destroy();
			enemyCars.splice(i, 1);
		}
		if (playerCar.intersects(enemyCar)) {
			// Update high score if needed
			if (score > highScore) {
				highScore = score;
				storage.highScore = highScore;
				highScoreTxt.setText('High Score: ' + highScore);
			}
			// Set the final score before game over
			LK.setScore(score);
			LK.showGameOver();
		}
	}
	if (LK.ticks % 120 == 0) {
		// Spawn new enemy cars every 2 seconds to keep more space between them
		spawnEnemyCar();
	}
};
var inputState = {
	leftPressed: false,
	rightPressed: false
};
game.down = function (x, y, obj) {
	if (x < 1024) {
		inputState.leftPressed = true;
		playerCar.x = 512; // Instantly move to left lane
		inputState.rightPressed = false;
	} else {
		inputState.rightPressed = true;
		playerCar.x = 1536; // Instantly move to right lane
		inputState.leftPressed = false;
	}
};
game.up = function (x, y, obj) {
	inputState.leftPressed = false;
	inputState.rightPressed = false;
};

===================================================================
--- original.js
+++ change.js
@@ -97,10 +97,13 @@
 var smokeParticles = [];
 function createSmoke(x, y, amount) {
 	for (var i = 0; i < amount; i++) {
 		var smoke = new Smoke();
-		smoke.x = x + (Math.random() - 0.5) * 40; // Random position near car
-		smoke.y = y + 200; // Position in front of car (below car in screen coordinates)
+		// Alternate between left and right sides of the car
+		var side = i % 2 === 0 ? -1 : 1;
+		// Position smoke on the left or right side of the car
+		smoke.x = x + side * 100 + (Math.random() - 0.5) * 20; // Offset from car sides
+		smoke.y = y + 200; // Position behind car (below car in screen coordinates)
 		smokeParticles.push(smoke);
 		game.addChild(smoke);
 	}
 }