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

/**** 
* Classes
****/ 
// Enemy Car Class
var EnemyCar = Container.expand(function () {
	var self = Container.call(this);
	var car = self.attachAsset('enemyCar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.lane = 1;
	self.speed = 18;
	self.update = function () {
		self.y += self.speed * gameSpeed;
	};
	return self;
});
// Lane Divider Class
var LaneDivider = Container.expand(function () {
	var self = Container.call(this);
	var div = self.attachAsset('laneDivider', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 18;
	self.update = function () {
		self.y += self.speed * gameSpeed;
	};
	return self;
});
// Obstacle Class
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obs = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.lane = 1;
	self.speed = 18;
	self.update = function () {
		self.y += self.speed * gameSpeed;
	};
	return self;
});
// Player Car Class
var PlayerCar = Container.expand(function () {
	var self = Container.call(this);
	var car = self.attachAsset('playerCar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.lane = 1; // 0: left, 1: center, 2: right
	self.setLane = function (laneIdx) {
		self.lane = laneIdx;
		// Animate to new lane position
		var targetX = lanes[self.lane];
		tween(self, {
			x: targetX
		}, {
			duration: 120,
			easing: tween.cubicOut
		});
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x222222
});

/**** 
* Game Code
****/ 
// Spell bottle asset (example: blue bottle, 120x180)
// When the player picks up the magic bottle, the car bursts into flames (flame burst effect)
// Lane positions (3 lanes)
// Car (player)
// Enemy car
// Obstacle (barrier)
// Road lane divider
// Sound for crash
// Sound for lane change
// Music (background)
var laneCount = 3;
var laneWidth = 520; // Increased lane width for more space between lanes
var lanes = [2048 / 2 - laneWidth,
// left
2048 / 2,
// center
2048 / 2 + laneWidth // right
];
// Game variables
var playerCar;
var enemyCars = [];
var obstacles = [];
var laneDividers = [];
var score = 0;
var highScore = storage.highScore || 0;
var scoreTxt;
var highScoreTxt;
var gameSpeed = 1;
var ticksSinceStart = 0;
var swipeStartX = null;
var swipeStartY = null;
var swipeActive = false;
var lastLane = 1;
var spawnTick = 0;
var dividerSpacing = 320;
var dragNode = null;
// Score display
scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0.5);
LK.gui.top.addChild(scoreTxt);
// Shield timer display
var shieldTxt = new Text2('', {
	size: 80,
	fill: 0x2BD5E6
});
shieldTxt.anchor.set(0.5, 0.5);
LK.gui.top.addChild(shieldTxt);
// High Score display
highScoreTxt = new Text2('HI: ' + highScore, {
	size: 60,
	fill: 0xFFFF00
});
highScoreTxt.anchor.set(0.5, 0.5);
LK.gui.top.addChild(highScoreTxt);
// Add swipe left gesture to high score text
var hiSwipeStartX = null;
var hiSwipeStartY = null;
var hiSwipeActive = false;
highScoreTxt.down = function (x, y, obj) {
	hiSwipeStartX = x;
	hiSwipeStartY = y;
	hiSwipeActive = true;
};
highScoreTxt.move = function (x, y, obj) {
	if (!hiSwipeActive) return;
	var dx = x - hiSwipeStartX;
	var dy = y - hiSwipeStartY;
	// Only consider horizontal swipes, ignore vertical
	if (Math.abs(dx) > 60 && Math.abs(dx) > Math.abs(dy)) {
		if (dx < 0) {
			// Swipe left detected on high score text
			// Flash the high score text white for feedback
			tween(highScoreTxt, {
				tint: 0xffffff
			}, {
				duration: 80,
				yoyo: true,
				repeat: 1,
				onComplete: function onComplete() {
					highScoreTxt.tint = 0xFFFF00;
				}
			});
			hiSwipeActive = false;
		}
	}
};
highScoreTxt.up = function (x, y, obj) {
	hiSwipeActive = false;
};
// Start music
LK.playMusic('bgmusic');
// Create player car
playerCar = new PlayerCar();
playerCar.x = lanes[1];
playerCar.y = 2732 - 500;
playerCar.setLane(1);
// Shield properties
playerCar.shieldActive = false;
playerCar.shieldTicks = 0;
// Add shield effect asset (invisible by default)
var shieldEffect = LK.getAsset('centerCircle', {
	anchorX: 0.5,
	anchorY: 0.5,
	scaleX: 2.2,
	scaleY: 1.2,
	x: playerCar.x,
	y: playerCar.y,
	alpha: 0.5,
	tint: 0xffffff
});
shieldEffect.visible = false;
game.addChild(shieldEffect);
game.addChild(playerCar);
// Add two vertical side stripes (left and right) to the play area
var sideStripeWidth = 60;
var sideStripeHeight = 2732;
var leftStripe = LK.getAsset('laneDivider', {
	anchorX: 0.5,
	anchorY: 0,
	width: sideStripeWidth,
	height: sideStripeHeight,
	x: sideStripeWidth / 2,
	y: 0
});
var rightStripe = LK.getAsset('laneDivider', {
	anchorX: 0.5,
	anchorY: 0,
	width: sideStripeWidth,
	height: sideStripeHeight,
	x: 2048 - sideStripeWidth / 2,
	y: 0
});
game.addChild(leftStripe);
game.addChild(rightStripe);
// Create lane dividers (vertical lines for each lane)
// For 3 lanes, we want to copy the center lane divider and place it to the right and left of the center stripe, without adding extra lines
// The center divider is between lane 0 and lane 1, and between lane 1 and lane 2
// So, for 3 lanes, we want to draw the two dividers: one between lane 0 and 1, and one between lane 1 and 2
var dividerOffsets = [];
// Find the X positions for the two dividers (between lanes)
for (var l = 1; l < laneCount; l++) {
	dividerOffsets.push((lanes[l - 1] + lanes[l]) / 2);
}
// Now, for each divider, draw a set of stripes down the screen
for (var d = 0; d < dividerOffsets.length; d++) {
	for (var i = 0; i < 10; i++) {
		// Center LaneDivider
		var divider = new LaneDivider();
		divider.x = dividerOffsets[d];
		divider.y = i * dividerSpacing;
		laneDividers.push(divider);
		game.addChild(divider);
		// Left copy
		var dividerLeft = new LaneDivider();
		dividerLeft.x = dividerOffsets[d] - laneWidth;
		dividerLeft.y = i * dividerSpacing;
		laneDividers.push(dividerLeft);
		game.addChild(dividerLeft);
		// Right copy
		var dividerRight = new LaneDivider();
		dividerRight.x = dividerOffsets[d] + laneWidth;
		dividerRight.y = i * dividerSpacing;
		laneDividers.push(dividerRight);
		game.addChild(dividerRight);
	}
}
// Prepare for dynamic spell bottle spawning
var spellBottle = null;
var spellBottleActive = false;
var spellBottleLane = 1;
// Add: track last spell bottle spawn tick to limit spawn rate
var lastSpellBottleSpawnTick = -1000;
// Helper: spawn enemy car or obstacle
function spawnObstacleOrEnemy() {
	// Randomly decide: 70% enemy car, 30% obstacle
	var isEnemy = Math.random() < 0.7;
	var laneIdx = Math.floor(Math.random() * laneCount);
	var y = -300;
	if (isEnemy) {
		var enemy = new EnemyCar();
		enemy.lane = laneIdx;
		enemy.x = lanes[laneIdx];
		enemy.y = y;
		enemyCars.push(enemy);
		game.addChild(enemy);
	} else {
		var obs = new Obstacle();
		obs.lane = laneIdx;
		obs.x = lanes[laneIdx];
		obs.y = y;
		obstacles.push(obs);
		game.addChild(obs);
	}
}
// Helper: update score
function updateScore(val) {
	score = val;
	scoreTxt.setText(score);
	if (score > highScore) {
		highScore = score;
		highScoreTxt.setText('HI: ' + highScore);
		storage.highScore = highScore;
	}
}
// Touch/drag/swipe handling
game.down = function (x, y, obj) {
	swipeStartX = x;
	swipeStartY = y;
	swipeActive = true;
	dragNode = playerCar;
};
game.move = function (x, y, obj) {
	// Only handle swipe if active
	if (!swipeActive) return;
	if (!dragNode) return;
	var dx = x - swipeStartX;
	var dy = y - swipeStartY;
	// Only consider horizontal swipes, ignore vertical
	if (Math.abs(dx) > 80 && Math.abs(dx) > Math.abs(dy)) {
		var newLane = playerCar.lane;
		if (dx < 0 && playerCar.lane > 0) {
			newLane = playerCar.lane - 1;
		} else if (dx > 0 && playerCar.lane < laneCount - 1) {
			newLane = playerCar.lane + 1;
		}
		if (newLane !== playerCar.lane) {
			playerCar.setLane(newLane);
			LK.getSound('swipe').play();
			swipeActive = false;
			dragNode = null;
		}
	}
};
game.up = function (x, y, obj) {
	swipeActive = false;
	dragNode = null;
};
// Main game update loop
game.update = function () {
	ticksSinceStart++;
	// Only increase game speed after score reaches 50
	if (score >= 50) {
		if (ticksSinceStart % 60 === 0 && gameSpeed < 4) {
			// Increase speed every second, and allow it to go higher
			if (gameSpeed < 2) {
				gameSpeed += 0.08;
			} else if (gameSpeed < 3) {
				gameSpeed += 0.12;
			} else {
				gameSpeed += 0.18;
			}
			if (gameSpeed > 4) gameSpeed = 4;
		}
	} else {
		gameSpeed = 1;
	}
	// Move lane dividers, loop to top
	for (var i = 0; i < laneDividers.length; i++) {
		var div = laneDividers[i];
		div.update();
		if (div.y > 2732 + 60) {
			div.y -= dividerSpacing * 10;
		}
	}
	// Spawn or move spell bottle
	if (!spellBottleActive) {
		// Determine spawn cooldown and chance based on score
		var bottleCooldown = score >= 50 ? 300 : 600; // 5s if score>=50, else 10s
		var bottleChance = score >= 50 ? 1 / 60 : 1 / 120; // 1/60 per frame if score>=50, else 1/120
		// Only allow spawn if enough time has passed since last spawn
		if (ticksSinceStart - lastSpellBottleSpawnTick > bottleCooldown) {
			// Try to spawn with the appropriate chance
			if (Math.random() < bottleChance) {
				spellBottleLane = Math.floor(Math.random() * laneCount);
				var bottleX = lanes[spellBottleLane];
				// Place the bottle at a fixed Y position (e.g., 900px from the top)
				var bottleY = 900;
				spellBottle = LK.getAsset('spellBottle', {
					anchorX: 0.5,
					anchorY: 1.0,
					x: bottleX,
					y: bottleY
				});
				game.addChild(spellBottle);
				spellBottleActive = true;
				lastSpellBottleSpawnTick = ticksSinceStart;
			}
		}
	} else if (spellBottle) {
		// Move the spell bottle down the screen
		spellBottle.y += 18 * gameSpeed;
		// Off screen? Remove (if it has scrolled above the visible area)
		if (spellBottle.y < -200 || spellBottle.y > 2732 + 200) {
			spellBottle.destroy();
			spellBottle = null;
			spellBottleActive = false;
		}
		// Check collision with playerCar for shield pickup
		if (spellBottle && !playerCar.shieldActive && spellBottle.intersects(playerCar)) {
			// Grant shield for 3 seconds
			playerCar.shieldActive = true;
			playerCar.shieldTicks = 180; // 3 seconds at 60fps
			// Add flame burst effect: flashObject with orange/yellow color, then white
			LK.effects.flashObject(playerCar, 0xffa500, 350);
			LK.setTimeout(function () {
				LK.effects.flashObject(playerCar, 0xffff00, 350);
			}, 350);
			spellBottle.destroy();
			spellBottle = null;
			spellBottleActive = false;
		}
	}
	// Spawn enemies/obstacles every 40-60 ticks, randomize
	spawnTick++;
	var spawnInterval = 40 + Math.floor(Math.random() * 20);
	if (spawnTick > spawnInterval) {
		spawnObstacleOrEnemy();
		spawnTick = 0;
	}
	// Update enemy cars
	for (var i = enemyCars.length - 1; i >= 0; i--) {
		var enemy = enemyCars[i];
		enemy.update();
		// Off screen
		if (enemy.y > 2732 + 300) {
			enemy.destroy();
			enemyCars.splice(i, 1);
			updateScore(score + 1);
			continue;
		}
		// Collision with spell bottle
		if (spellBottle && enemy.intersects(spellBottle)) {
			spellBottle.destroy();
			spellBottle = null;
			spellBottleActive = false;
		}
		// Collision with player
		if (enemy.intersects(playerCar)) {
			if (playerCar.shieldActive) {
				// Ignore collision, let player pass through enemy car while shield is active
				continue;
			} else {
				LK.getSound('crash').play();
				LK.effects.flashScreen(0xff0000, 800);
				// Explosion effect at player car position
				LK.effects.flashObject(playerCar, 0xffffff, 700);
				LK.showGameOver();
				return;
			}
		}
	}
	// Update obstacles
	for (var j = obstacles.length - 1; j >= 0; j--) {
		var obs = obstacles[j];
		obs.update();
		// Off screen
		if (obs.y > 2732 + 200) {
			obs.destroy();
			obstacles.splice(j, 1);
			updateScore(score + 1);
			continue;
		}
		// Collision with player
		if (obs.intersects(playerCar)) {
			if (playerCar.shieldActive) {
				// Ignore collision, let player pass through obstacle while shield is active
				continue;
			} else {
				LK.getSound('crash').play();
				LK.effects.flashScreen(0xff0000, 800);
				// Explosion effect at player car position
				LK.effects.flashObject(playerCar, 0xffffff, 700);
				LK.showGameOver();
				return;
			}
		}
	}
	;
	// Shield timer logic
	if (playerCar.shieldActive) {
		playerCar.shieldTicks--;
		// Show shield seconds left (rounded up)
		var shieldSeconds = Math.ceil(playerCar.shieldTicks / 60);
		shieldTxt.setText("Shield: " + shieldSeconds + "s");
		// Show shield effect
		shieldEffect.visible = true;
		// Keep shield effect centered on playerCar
		shieldEffect.x = playerCar.x;
		shieldEffect.y = playerCar.y;
		if (playerCar.shieldTicks <= 0) {
			playerCar.shieldActive = false;
			playerCar.shieldTicks = 0;
			shieldTxt.setText('');
			shieldEffect.visible = false;
		}
	} else {
		shieldTxt.setText('');
		shieldEffect.visible = false;
	}
};
// Place high score text to the left of the score text, both horizontally aligned
highScoreTxt.x = LK.gui.top.width / 2 - 220;
highScoreTxt.y = scoreTxt.height / 2 + 10;
scoreTxt.x = LK.gui.top.width / 2 - 60;
scoreTxt.y = scoreTxt.height / 2 + 10;
// Position shield timer text directly below score
shieldTxt.x = LK.gui.top.width / 2;
shieldTxt.y = scoreTxt.y + scoreTxt.height / 2 + shieldTxt.height / 2 + 10;

===================================================================
--- original.js
+++ change.js
@@ -6,35 +6,70 @@
 
 /**** 
 * Classes
 ****/ 
-// PlayerCar class
-var PlayerCar = Container.expand(function () {
+// Enemy Car Class
+var EnemyCar = Container.expand(function () {
 	var self = Container.call(this);
-	// Attach player car image asset
-	var carSprite = self.attachAsset('playerCar', {
+	var car = self.attachAsset('enemyCar', {
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
-	// Lane index (0, 1, 2)
 	self.lane = 1;
-	// Set lane and update X position
-	self.setLane = function (laneIdx) {
-		self.lane = laneIdx;
-		// lanes is in global scope
-		self.x = lanes[laneIdx];
+	self.speed = 18;
+	self.update = function () {
+		self.y += self.speed * gameSpeed;
 	};
-	// Update method (not much to do for player car, but keep for future)
+	return self;
+});
+// Lane Divider Class
+var LaneDivider = Container.expand(function () {
+	var self = Container.call(this);
+	var div = self.attachAsset('laneDivider', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 18;
 	self.update = function () {
-		// Defensive: keep car within bounds
-		if (self.x < 0) self.x = 0;
-		if (self.x > 2048) self.x = 2048;
-		// Defensive: keep car within screen vertically
-		if (self.y < 0) self.y = 0;
-		if (self.y > 2732) self.y = 2732;
+		self.y += self.speed * gameSpeed;
 	};
 	return self;
 });
+// Obstacle Class
+var Obstacle = Container.expand(function () {
+	var self = Container.call(this);
+	var obs = self.attachAsset('obstacle', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.lane = 1;
+	self.speed = 18;
+	self.update = function () {
+		self.y += self.speed * gameSpeed;
+	};
+	return self;
+});
+// Player Car Class
+var PlayerCar = Container.expand(function () {
+	var self = Container.call(this);
+	var car = self.attachAsset('playerCar', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.lane = 1; // 0: left, 1: center, 2: right
+	self.setLane = function (laneIdx) {
+		self.lane = laneIdx;
+		// Animate to new lane position
+		var targetX = lanes[self.lane];
+		tween(self, {
+			x: targetX
+		}, {
+			duration: 120,
+			easing: tween.cubicOut
+		});
+	};
+	return self;
+});
 
 /**** 
 * Initialize Game
 ****/ 
@@ -45,8 +80,9 @@
 /**** 
 * Game Code
 ****/ 
 // Spell bottle asset (example: blue bottle, 120x180)
+// When the player picks up the magic bottle, the car bursts into flames (flame burst effect)
 // Lane positions (3 lanes)
 // Car (player)
 // Enemy car
 // Obstacle (barrier)
@@ -64,9 +100,8 @@
 ];
 // Game variables
 var playerCar;
 var enemyCars = [];
-var thiefEnemies = []; // Thief enemies array
 var obstacles = [];
 var laneDividers = [];
 var score = 0;
 var highScore = storage.highScore || 0;
@@ -78,9 +113,8 @@
 var swipeStartY = null;
 var swipeActive = false;
 var lastLane = 1;
 var spawnTick = 0;
-var thiefSpawnTick = 0; // Thief spawn timer
 var dividerSpacing = 320;
 var dragNode = null;
 // Score display
 scoreTxt = new Text2('0', {
@@ -350,9 +384,13 @@
 		if (spellBottle && !playerCar.shieldActive && spellBottle.intersects(playerCar)) {
 			// Grant shield for 3 seconds
 			playerCar.shieldActive = true;
 			playerCar.shieldTicks = 180; // 3 seconds at 60fps
-			// Optionally, you could add a visual effect here (not required)
+			// Add flame burst effect: flashObject with orange/yellow color, then white
+			LK.effects.flashObject(playerCar, 0xffa500, 350);
+			LK.setTimeout(function () {
+				LK.effects.flashObject(playerCar, 0xffff00, 350);
+			}, 350);
 			spellBottle.destroy();
 			spellBottle = null;
 			spellBottleActive = false;
 		}
@@ -363,23 +401,8 @@
 	if (spawnTick > spawnInterval) {
 		spawnObstacleOrEnemy();
 		spawnTick = 0;
 	}
-	// Spawn thief enemy after 50 points, every 120-180 ticks, max 1 on screen
-	if (score >= 50) {
-		thiefSpawnTick++;
-		var thiefInterval = 120 + Math.floor(Math.random() * 60);
-		if (thiefSpawnTick > thiefInterval && thiefEnemies.length < 1) {
-			var thief = new ThiefEnemy();
-			thief.lane = Math.floor(Math.random() * laneCount);
-			thief.x = lanes[thief.lane];
-			thief.y = -300;
-			thief.targetLane = thief.lane;
-			thiefEnemies.push(thief);
-			game.addChild(thief);
-			thiefSpawnTick = 0;
-		}
-	}
 	// Update enemy cars
 	for (var i = enemyCars.length - 1; i >= 0; i--) {
 		var enemy = enemyCars[i];
 		enemy.update();
@@ -410,40 +433,8 @@
 				return;
 			}
 		}
 	}
-	// Update thief enemies
-	for (var t = thiefEnemies.length - 1; t >= 0; t--) {
-		var thief = thiefEnemies[t];
-		thief.update();
-		// Off screen
-		if (thief.y > 2732 + 300) {
-			thief.destroy();
-			thiefEnemies.splice(t, 1);
-			updateScore(score + 3); // Thief gives more points
-			continue;
-		}
-		// Collision with spell bottle
-		if (spellBottle && thief.intersects(spellBottle)) {
-			spellBottle.destroy();
-			spellBottle = null;
-			spellBottleActive = false;
-		}
-		// Collision with player
-		if (thief.intersects(playerCar)) {
-			if (playerCar.shieldActive) {
-				// Ignore collision, let player pass through thief while shield is active
-				continue;
-			} else {
-				LK.getSound('crash').play();
-				LK.effects.flashScreen(0xff0000, 800);
-				// Explosion effect at player car position
-				LK.effects.flashObject(playerCar, 0xffffff, 700);
-				LK.showGameOver();
-				return;
-			}
-		}
-	}
 	// Update obstacles
 	for (var j = obstacles.length - 1; j >= 0; j--) {
 		var obs = obstacles[j];
 		obs.update();