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

/**** 
* Classes
****/ 
// Bonus Item Class
var Bonus = Container.expand(function () {
	var self = Container.call(this);
	var b = self.attachAsset('bonus', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = b.width;
	self.height = b.height;
	self.speed = 18 + Math.random() * 8; // Will be set by game
	self.lane = 0;
	self.update = function () {
		self.y += self.speed;
	};
	self.getBounds = function () {
		// Use local variables to avoid recursion
		var w = b.width;
		var h = b.height;
		return {
			x: self.x - w / 2,
			y: self.y - h / 2,
			width: w,
			height: h
		};
	};
	return self;
});
// 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.width = car.width;
	self.height = car.height;
	self.speed = 18 + Math.random() * 8; // Will be set by game
	self.lane = 0;
	self.update = function () {
		self.y += self.speed;
	};
	self.getBounds = function () {
		var w = car.width;
		var h = car.height;
		return {
			x: self.x - w / 2,
			y: self.y - h / 2,
			width: w,
			height: h
		};
	};
	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.width = obs.width;
	self.height = obs.height;
	self.speed = 18 + Math.random() * 8; // Will be set by game
	self.lane = 0;
	self.update = function () {
		self.y += self.speed;
	};
	self.getBounds = function () {
		var w = obs.width;
		var h = obs.height;
		return {
			x: self.x - w / 2,
			y: self.y - h / 2,
			width: w,
			height: h
		};
	};
	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.width = car.width;
	self.height = car.height;
	// For touch drag offset
	self.dragOffsetX = 0;
	self.dragOffsetY = 0;
	// For collision
	self.getBounds = function () {
		var w = car.width;
		var h = car.height;
		return {
			x: self.x - w / 2,
			y: self.y - h / 2,
			width: w,
			height: h
		};
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// Bonus item
// Road lane
// Obstacle (barrier)
// Enemy car
// Car (player)
// Road and lane setup
var roadWidth = 900;
var roadLeft = (2048 - roadWidth) / 2;
var roadRight = roadLeft + roadWidth;
var laneCount = 4;
var laneWidth = roadWidth / laneCount;
var laneCenters = [];
for (var i = 0; i < laneCount; i++) {
	laneCenters.push(roadLeft + laneWidth / 2 + i * laneWidth);
}
// Draw lane markers (scrolling effect)
var laneMarkers = [];
for (var i = 1; i < laneCount; i++) {
	for (var j = 0; j < 6; j++) {
		var marker = LK.getAsset('lane', {
			anchorX: 0.5,
			anchorY: 0.5,
			x: roadLeft + i * laneWidth,
			y: j * 400
		});
		marker.laneIdx = i;
		marker.offsetIdx = j;
		game.addChild(marker);
		laneMarkers.push(marker);
	}
}
// Player car
var player = new PlayerCar();
player.x = laneCenters[1];
player.y = 2732 - 500;
game.addChild(player);
// Score
var score = 0;
var scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Bonus score
var bonusScore = 0;
var bonusTxt = new Text2('', {
	size: 60,
	fill: 0x43A047
});
bonusTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(bonusTxt);
// Game state
var enemyCars = [];
var obstacles = [];
var bonuses = [];
var gameSpeed = 18;
var ticksSinceStart = 0;
var lastSpawnTick = 0;
var lastBonusTick = 0;
var isDragging = false;
var dragStartX = 0;
var dragStartY = 0;
var playerStartX = 0;
var playerStartY = 0;
var lastCrash = false;
// Touch controls
game.down = function (x, y, obj) {
	// Only start drag if touch is on player car
	var local = player.toLocal(game.toGlobal({
		x: x,
		y: y
	}));
	if (local.x > -player.width / 2 && local.x < player.width / 2 && local.y > -player.height / 2 && local.y < player.height / 2) {
		isDragging = true;
		dragStartX = x;
		dragStartY = y;
		playerStartX = player.x;
		playerStartY = player.y;
	}
};
game.move = function (x, y, obj) {
	if (isDragging) {
		var dx = x - dragStartX;
		// Only allow horizontal movement, clamp to road
		var newX = playerStartX + dx;
		if (newX < roadLeft + player.width / 2) newX = roadLeft + player.width / 2;
		if (newX > roadRight - player.width / 2) newX = roadRight - player.width / 2;
		player.x = newX;
	}
};
game.up = function (x, y, obj) {
	isDragging = false;
};
// Helper: collision check (AABB)
function intersects(a, b) {
	var ab = a.getBounds();
	var bb = b.getBounds();
	return ab.x < bb.x + bb.width && ab.x + ab.width > bb.x && ab.y < bb.y + bb.height && ab.y + ab.height > bb.y;
}
// Main game loop
game.update = function () {
	ticksSinceStart++;
	// Increase speed over time
	if (ticksSinceStart % 300 == 0 && gameSpeed < 38) {
		gameSpeed += 2;
	}
	// Move lane markers for scrolling effect
	for (var i = 0; i < laneMarkers.length; i++) {
		var marker = laneMarkers[i];
		marker.y += gameSpeed;
		if (marker.y > 2732) {
			marker.y -= 2400;
		}
	}
	// Spawn enemy cars
	if (ticksSinceStart - lastSpawnTick > 36) {
		lastSpawnTick = ticksSinceStart;
		// Randomly pick lanes to spawn cars/obstacles
		var spawnLanes = [];
		for (var i = 0; i < laneCount; i++) {
			if (Math.random() < 0.5) spawnLanes.push(i);
		}
		if (spawnLanes.length == 0) spawnLanes.push(Math.floor(Math.random() * laneCount));
		// Limit to max 3 obstacles per spawn
		var obstacleCountThisSpawn = 0;
		// Track which lanes will have obstacles this spawn
		var obstacleLanesThisSpawn = [];
		for (var i = 0; i < spawnLanes.length; i++) {
			// If already 3 obstacles, force enemy car for the rest
			var forceEnemy = obstacleCountThisSpawn >= 3;
			if (!forceEnemy && Math.random() >= 0.7) {
				// Obstacle
				var o = new Obstacle();
				o.x = laneCenters[spawnLanes[i]];
				o.y = -100;
				o.speed = gameSpeed;
				o.lane = spawnLanes[i];
				obstacles.push(o);
				game.addChild(o);
				obstacleCountThisSpawn++;
				obstacleLanesThisSpawn.push(spawnLanes[i]);
			} else {
				// Enemy car
				var e = new EnemyCar();
				e.x = laneCenters[spawnLanes[i]];
				e.y = -200;
				e.speed = gameSpeed;
				e.lane = spawnLanes[i];
				enemyCars.push(e);
				game.addChild(e);
			}
		}
		// Store obstacle lanes for this tick for bonus spawn logic
		game._obstacleLanesThisSpawn = obstacleLanesThisSpawn;
	} else {
		// If not spawning this tick, clear obstacle lanes
		game._obstacleLanesThisSpawn = [];
	}
	// Spawn bonus
	if (ticksSinceStart - lastBonusTick > 180 && Math.random() < 0.5) {
		lastBonusTick = ticksSinceStart;
		// Prevent bonus from spawning in a lane with an obstacle this tick
		var availableBonusLanes = [];
		for (var i = 0; i < laneCount; i++) {
			var blocked = false;
			if (game._obstacleLanesThisSpawn) {
				for (var j = 0; j < game._obstacleLanesThisSpawn.length; j++) {
					if (game._obstacleLanesThisSpawn[j] === i) {
						blocked = true;
						break;
					}
				}
			}
			if (!blocked) availableBonusLanes.push(i);
		}
		if (availableBonusLanes.length > 0) {
			var laneIdx = availableBonusLanes[Math.floor(Math.random() * availableBonusLanes.length)];
			var b = new Bonus();
			b.x = laneCenters[laneIdx];
			b.y = -100;
			b.speed = gameSpeed;
			b.lane = laneIdx;
			bonuses.push(b);
			game.addChild(b);
		}
	}
	// Move enemy cars
	for (var i = enemyCars.length - 1; i >= 0; i--) {
		var e = enemyCars[i];
		e.update();
		if (e.y > 2732 + 200) {
			e.destroy();
			enemyCars.splice(i, 1);
			continue;
		}
		// Collision with player
		if (intersects(player, e)) {
			if (!lastCrash) {
				LK.effects.flashScreen(0xff0000, 800);
				lastCrash = true;
				LK.showGameOver();
				return;
			}
		}
	}
	// Move obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var o = obstacles[i];
		o.update();
		if (o.y > 2732 + 100) {
			o.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Collision with player
		if (intersects(player, o)) {
			if (!lastCrash) {
				LK.effects.flashScreen(0xff0000, 800);
				lastCrash = true;
				LK.showGameOver();
				return;
			}
		}
	}
	// Move bonuses
	for (var i = bonuses.length - 1; i >= 0; i--) {
		var b = bonuses[i];
		b.update();
		if (b.y > 2732 + 100) {
			b.destroy();
			bonuses.splice(i, 1);
			continue;
		}
		// Collision with player
		if (intersects(player, b)) {
			bonusScore += 100;
			score += 100;
			LK.effects.flashObject(player, 0x43a047, 400);
			b.destroy();
			bonuses.splice(i, 1);
			// Show bonus text
			bonusTxt.setText("+100!");
			(function () {
				var t = bonusTxt;
				t.alpha = 1;
				tween(t, {
					alpha: 0
				}, {
					duration: 900,
					easing: tween.linear,
					onFinish: function onFinish() {
						t.setText('');
					}
				});
			})();
		}
	}
	// Score increases with distance
	if (!lastCrash) {
		score += Math.floor(gameSpeed / 2);
		scoreTxt.setText(score + "");
	}
};
// Reset crash state on new game
LK.on('gameStart', function () {
	lastCrash = false;
	score = 0;
	bonusScore = 0;
	scoreTxt.setText('0');
	bonusTxt.setText('');
	// Remove all cars, obstacles, bonuses
	for (var i = enemyCars.length - 1; i >= 0; i--) {
		enemyCars[i].destroy();
		enemyCars.splice(i, 1);
	}
	for (var i = obstacles.length - 1; i >= 0; i--) {
		obstacles[i].destroy();
		obstacles.splice(i, 1);
	}
	for (var i = bonuses.length - 1; i >= 0; i--) {
		bonuses[i].destroy();
		bonuses.splice(i, 1);
	}
	player.x = laneCenters[1];
	player.y = 2732 - 500;
	gameSpeed = 18;
	ticksSinceStart = 0;
	lastSpawnTick = 0;
	lastBonusTick = 0;
});
// Prevent player from moving into top left menu area
// (handled by roadLeft, but double check)
if (roadLeft < 100) {
	roadLeft = 100;
	roadWidth = roadRight - roadLeft;
	laneWidth = roadWidth / laneCount;
	for (var i = 0; i < laneCount; i++) {
		laneCenters[i] = roadLeft + laneWidth / 2 + i * laneWidth;
	}
}

===================================================================
--- original.js
+++ change.js
@@ -246,8 +246,10 @@
 		}
 		if (spawnLanes.length == 0) spawnLanes.push(Math.floor(Math.random() * laneCount));
 		// Limit to max 3 obstacles per spawn
 		var obstacleCountThisSpawn = 0;
+		// Track which lanes will have obstacles this spawn
+		var obstacleLanesThisSpawn = [];
 		for (var i = 0; i < spawnLanes.length; i++) {
 			// If already 3 obstacles, force enemy car for the rest
 			var forceEnemy = obstacleCountThisSpawn >= 3;
 			if (!forceEnemy && Math.random() >= 0.7) {
@@ -259,8 +261,9 @@
 				o.lane = spawnLanes[i];
 				obstacles.push(o);
 				game.addChild(o);
 				obstacleCountThisSpawn++;
+				obstacleLanesThisSpawn.push(spawnLanes[i]);
 			} else {
 				// Enemy car
 				var e = new EnemyCar();
 				e.x = laneCenters[spawnLanes[i]];
@@ -270,20 +273,41 @@
 				enemyCars.push(e);
 				game.addChild(e);
 			}
 		}
+		// Store obstacle lanes for this tick for bonus spawn logic
+		game._obstacleLanesThisSpawn = obstacleLanesThisSpawn;
+	} else {
+		// If not spawning this tick, clear obstacle lanes
+		game._obstacleLanesThisSpawn = [];
 	}
 	// Spawn bonus
 	if (ticksSinceStart - lastBonusTick > 180 && Math.random() < 0.5) {
 		lastBonusTick = ticksSinceStart;
-		var laneIdx = Math.floor(Math.random() * laneCount);
-		var b = new Bonus();
-		b.x = laneCenters[laneIdx];
-		b.y = -100;
-		b.speed = gameSpeed;
-		b.lane = laneIdx;
-		bonuses.push(b);
-		game.addChild(b);
+		// Prevent bonus from spawning in a lane with an obstacle this tick
+		var availableBonusLanes = [];
+		for (var i = 0; i < laneCount; i++) {
+			var blocked = false;
+			if (game._obstacleLanesThisSpawn) {
+				for (var j = 0; j < game._obstacleLanesThisSpawn.length; j++) {
+					if (game._obstacleLanesThisSpawn[j] === i) {
+						blocked = true;
+						break;
+					}
+				}
+			}
+			if (!blocked) availableBonusLanes.push(i);
+		}
+		if (availableBonusLanes.length > 0) {
+			var laneIdx = availableBonusLanes[Math.floor(Math.random() * availableBonusLanes.length)];
+			var b = new Bonus();
+			b.x = laneCenters[laneIdx];
+			b.y = -100;
+			b.speed = gameSpeed;
+			b.lane = laneIdx;
+			bonuses.push(b);
+			game.addChild(b);
+		}
 	}
 	// Move enemy cars
 	for (var i = enemyCars.length - 1; i >= 0; i--) {
 		var e = enemyCars[i];