/**** 
* 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 = 8;
	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 = 8;
	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.speedX = (Math.random() - 0.5) * 2; // Random horizontal drift
	self.speedY = 1 + Math.random() * 2; // Move backward speed
	self.initialDistance = 0; // Track distance traveled
	self.maxAlpha = 0.8 + Math.random() * 0.2; // Maximum density at start
	self.alpha = self.maxAlpha; // Start with maximum opacity
	self.fadingDistance = 40 + Math.random() * 40; // Distance at which smoke starts to fade
	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)
		// Update distance traveled
		self.initialDistance += self.speedY;
		// Start dense and become less dense as it moves backward
		self.alpha = Math.max(0, self.maxAlpha * (1 - self.initialDistance / (self.fadingDistance * 2)));
		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);
scoreTxt.alpha = 0;
LK.gui.top.addChild(scoreTxt);
tween(scoreTxt, {
	alpha: 1
}, 800, {
	easing: "easeOutCubic"
});
var road = LK.getAsset('road', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 1024,
	y: 1366
});
road.alpha = 0;
road.scale.set(1.05, 1.05);
game.addChild(road);
tween(road, {
	alpha: 1
}, 1000, {
	easing: "easeOutCubic"
});
tween(road.scale, {
	x: 1,
	y: 1
}, 900, {
	easing: "easeOutCubic"
});
// Add road movement variables
var roadScrollSpeed = 16;
var roadInitialY = 1366;
var roadImageHeight = 2732;
// 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;
highScoreTxt.alpha = 0;
LK.gui.top.addChild(highScoreTxt);
tween(highScoreTxt, {
	alpha: 1
}, 1000, {
	easing: "easeOutCubic"
});
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
// Fade in the player car for a polished entrance
playerCar.alpha = 0;
playerCar.scale.set(1.2, 1.2);
tween(playerCar, {
	alpha: 1
}, 600, {
	easing: "easeOutCubic"
});
tween(playerCar.scale, {
	x: 1,
	y: 1
}, 400, {
	easing: "easeOutBack"
});
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;
		}
	}
	// Connected pattern: alternate between left and right lane for each spawn
	if (typeof spawnEnemyCar.lastLane === "undefined") {
		// Randomly start on left or right
		spawnEnemyCar.lastLane = Math.random() > 0.5 ? 0 : 1;
	}
	var laneXs = [512, 1536];
	var carHeight = 660;
	var verticalGapMultiplier = 3.5;
	var spawnY = topY;
	// Alternate lane for each new car
	spawnEnemyCar.lastLane = 1 - spawnEnemyCar.lastLane;
	var enemyCar = new EnemyCar();
	enemyCar.x = laneXs[spawnEnemyCar.lastLane];
	enemyCar.y = spawnY;
	enemyCars.push(enemyCar);
	game.addChild(enemyCar);
}
game.update = function () {
	// Move the road downward to simulate motion
	road.y += roadScrollSpeed;
	if (road.y > roadInitialY + roadImageHeight / 2) {
		road.y -= roadImageHeight;
	}
	// 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);
		}
	}
	var _loop = function _loop() {
			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);
				// Subtle pop animation for score text
				scoreTxt.scale.set(1.2, 1.2);
				tween(scoreTxt.scale, {
					x: 1,
					y: 1
				}, 200, {
					easing: "easeOutBack"
				});
				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)) {
				var _doShake = function doShake() {
					if (shakeIndex < shakeTimes) {
						playerCar.x = originalX + (shakeIndex % 2 === 0 ? shakeMagnitude : -shakeMagnitude);
						LK.setTimeout(function () {
							playerCar.x = originalX;
							shakeIndex++;
							_doShake();
						}, shakeStep);
					} else {
						playerCar.x = originalX;
						// Update high score if needed
						if (score > highScore) {
							highScore = score;
							storage.highScore = highScore;
							highScoreTxt.setText('High Score: ' + highScore);
							// Subtle fade-in and pop effect for new high score
							highScoreTxt.alpha = 0.2;
							highScoreTxt.scale.set(1.3, 1.3);
							tween(highScoreTxt, {
								alpha: 1
							}, 400, {
								easing: "easeOutCubic"
							});
							tween(highScoreTxt.scale, {
								x: 1,
								y: 1
							}, 300, {
								easing: "easeOutBack"
							});
						}
						// Set the final score before game over
						LK.setScore(score);
						LK.showGameOver();
					}
				};
				// Subtle shake effect for player car
				originalX = playerCar.x;
				shakeTimes = 6;
				shakeMagnitude = 30;
				shakeDuration = 180;
				shakeStep = shakeDuration / shakeTimes;
				shakeIndex = 0;
				_doShake();
				return {
					v: void 0
				}; // Prevent double game over
			}
		},
		enemyCar,
		originalX,
		shakeTimes,
		shakeMagnitude,
		shakeDuration,
		shakeStep,
		shakeIndex,
		_ret;
	for (var i = enemyCars.length - 1; i >= 0; i--) {
		_ret = _loop();
		if (_ret) return _ret.v;
	}
	if (LK.ticks % 120 == 0) {
		// Spawn new enemy cars every 2 seconds to keep more space between them
		spawnEnemyCar();
	}
};
game.down = function (x, y, obj) {
	if (x < 1024) {
		playerCar.x = 512; // Instantly move to left lane
	} else {
		playerCar.x = 1536; // Instantly move to right lane
	}
};
game.up = function (x, y, obj) {
	// No action needed
};

===================================================================
--- original.js
+++ change.js
@@ -201,54 +201,24 @@
 		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;
+	// Connected pattern: alternate between left and right lane for each spawn
+	if (typeof spawnEnemyCar.lastLane === "undefined") {
+		// Randomly start on left or right
+		spawnEnemyCar.lastLane = Math.random() > 0.5 ? 0 : 1;
 	}
-	// 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 laneXs = [512, 1536];
+	var carHeight = 660;
+	var verticalGapMultiplier = 3.5;
 	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;
-	}
+	// Alternate lane for each new car
+	spawnEnemyCar.lastLane = 1 - spawnEnemyCar.lastLane;
+	var enemyCar = new EnemyCar();
+	enemyCar.x = laneXs[spawnEnemyCar.lastLane];
+	enemyCar.y = spawnY;
+	enemyCars.push(enemyCar);
+	game.addChild(enemyCar);
 }
 game.update = function () {
 	// Move the road downward to simulate motion
 	road.y += roadScrollSpeed;