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

/**** 
* Classes
****/ 
var FallingBomb = Container.expand(function (lane) {
	var self = Container.call(this);
	var bombGraphics = self.attachAsset('bomb', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.lane = lane;
	self.speed = 8;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var FallingNote = Container.expand(function (noteType, lane) {
	var self = Container.call(this);
	var noteGraphics = self.attachAsset('note' + noteType, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.lane = lane;
	self.speed = 8;
	self.noteType = noteType;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.currentLane = 3;
	self.shieldActive = false;
	self.shieldTimer = 0;
	self.update = function () {
		if (self.shieldActive) {
			self.shieldTimer--;
			if (self.shieldTimer <= 0) {
				self.shieldActive = false;
				playerGraphics.tint = 0xFFFFFF;
			}
		}
	};
	self.activateShield = function () {
		self.shieldActive = true;
		self.shieldTimer = 300; // 5 seconds at 60fps
		playerGraphics.tint = 0xFFD700;
	};
	return self;
});
var ShieldPowerup = Container.expand(function (lane) {
	var self = Container.call(this);
	var shieldGraphics = self.attachAsset('shield', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.lane = lane;
	self.speed = 6;
	self.update = function () {
		self.y += self.speed;
		shieldGraphics.rotation += 0.1;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2C3E50
});

/**** 
* Game Code
****/ 
var player;
var staircases = [];
var fallingNotes = [];
var fallingBombs = [];
var shieldPowerups = [];
var hearts = [];
var scoreTxt;
var heartsTxt;
var playerHealth = 3;
var gameSpeed = 1;
var spawnTimer = 0;
var bombSpawnChance = 0.15;
var shieldSpawnChance = 0.05;
var lanePositions = [];
var laneWidth = 2048 / 7;
// Calculate lane positions
for (var i = 0; i < 7; i++) {
	lanePositions[i] = i * laneWidth + laneWidth / 2;
}
// Create staircases
for (var i = 0; i < 7; i++) {
	var staircase = game.addChild(LK.getAsset('staircase', {
		anchorX: 0.5,
		anchorY: 0.5
	}));
	staircase.x = lanePositions[i];
	staircase.y = 2732 - 100;
	staircases.push(staircase);
}
// Create tunnel at top
var tunnel = game.addChild(LK.getAsset('tunnel', {
	anchorX: 0.5,
	anchorY: 1
}));
tunnel.x = 2048 / 2;
tunnel.y = 200;
// Create player
player = game.addChild(new Player());
player.x = lanePositions[player.currentLane];
player.y = 2732 - 150;
// Create UI
scoreTxt = new Text2('Score: 0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
heartsTxt = new Text2('♥ ♥ ♥', {
	size: 80,
	fill: 0xFF0000
});
heartsTxt.anchor.set(1, 0);
LK.gui.topRight.addChild(heartsTxt);
function updateHeartsDisplay() {
	var heartsText = '';
	for (var i = 0; i < playerHealth; i++) {
		heartsText += '♥ ';
	}
	heartsTxt.setText(heartsText);
}
function spawnFallingObject() {
	var lane = Math.floor(Math.random() * 7);
	var x = lanePositions[lane];
	var spawnY = 150; // Spawn from bottom of tunnel
	if (Math.random() < shieldSpawnChance) {
		// Spawn shield powerup
		var shield = new ShieldPowerup(lane);
		shield.x = x;
		shield.y = spawnY;
		shieldPowerups.push(shield);
		game.addChild(shield);
	} else if (Math.random() < bombSpawnChance) {
		// Spawn bomb
		var bomb = new FallingBomb(lane);
		bomb.x = x;
		bomb.y = spawnY;
		fallingBombs.push(bomb);
		game.addChild(bomb);
	} else {
		// Spawn note
		var noteType = Math.floor(Math.random() * 7) + 1;
		var note = new FallingNote(noteType, lane);
		note.x = x;
		note.y = spawnY;
		fallingNotes.push(note);
		game.addChild(note);
	}
}
function movePlayer(targetLane) {
	if (targetLane >= 0 && targetLane < 7) {
		player.currentLane = targetLane;
		tween(player, {
			x: lanePositions[targetLane]
		}, {
			duration: 200,
			easing: tween.easeOut
		});
	}
}
game.down = function (x, y, obj) {
	var clickedLane = Math.floor(x / laneWidth);
	movePlayer(clickedLane);
};
game.update = function () {
	// Spawn falling objects
	spawnTimer++;
	if (spawnTimer >= Math.max(30 - Math.floor(LK.ticks / 600), 15)) {
		spawnFallingObject();
		spawnTimer = 0;
	}
	// Update and check falling notes
	for (var i = fallingNotes.length - 1; i >= 0; i--) {
		var note = fallingNotes[i];
		if (note.lastY === undefined) note.lastY = note.y;
		// Check if note went off screen
		if (note.lastY < 2732 && note.y >= 2732) {
			note.destroy();
			fallingNotes.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (note.lane === player.currentLane && note.intersects(player)) {
			LK.setScore(LK.getScore() + 10);
			scoreTxt.setText('Score: ' + LK.getScore());
			LK.getSound('catch').play();
			note.destroy();
			fallingNotes.splice(i, 1);
			continue;
		}
		note.lastY = note.y;
	}
	// Update and check falling bombs
	for (var i = fallingBombs.length - 1; i >= 0; i--) {
		var bomb = fallingBombs[i];
		if (bomb.lastY === undefined) bomb.lastY = bomb.y;
		// Check if bomb went off screen
		if (bomb.lastY < 2732 && bomb.y >= 2732) {
			bomb.destroy();
			fallingBombs.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (bomb.lane === player.currentLane && bomb.intersects(player) && !player.shieldActive) {
			playerHealth--;
			updateHeartsDisplay();
			LK.getSound('bomb_hit').play();
			LK.effects.flashScreen(0xff0000, 500);
			bomb.destroy();
			fallingBombs.splice(i, 1);
			if (playerHealth <= 0) {
				LK.showGameOver();
			}
			continue;
		}
		bomb.lastY = bomb.y;
	}
	// Update and check shield powerups
	for (var i = shieldPowerups.length - 1; i >= 0; i--) {
		var shield = shieldPowerups[i];
		if (shield.lastY === undefined) shield.lastY = shield.y;
		// Check if shield went off screen
		if (shield.lastY < 2732 && shield.y >= 2732) {
			shield.destroy();
			shieldPowerups.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (shield.lane === player.currentLane && shield.intersects(player)) {
			player.activateShield();
			LK.getSound('shield_pickup').play();
			shield.destroy();
			shieldPowerups.splice(i, 1);
			continue;
		}
		shield.lastY = shield.y;
	}
	// Gradually increase game speed
	if (LK.ticks % 1800 === 0) {
		// Every 30 seconds
		gameSpeed += 0.1;
		for (var i = 0; i < fallingNotes.length; i++) {
			fallingNotes[i].speed = 8 * gameSpeed;
		}
		for (var i = 0; i < fallingBombs.length; i++) {
			fallingBombs[i].speed = 8 * gameSpeed;
		}
		for (var i = 0; i < shieldPowerups.length; i++) {
			shieldPowerups[i].speed = 6 * gameSpeed;
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -111,8 +111,15 @@
 	staircase.x = lanePositions[i];
 	staircase.y = 2732 - 100;
 	staircases.push(staircase);
 }
+// Create tunnel at top
+var tunnel = game.addChild(LK.getAsset('tunnel', {
+	anchorX: 0.5,
+	anchorY: 1
+}));
+tunnel.x = 2048 / 2;
+tunnel.y = 200;
 // Create player
 player = game.addChild(new Player());
 player.x = lanePositions[player.currentLane];
 player.y = 2732 - 150;
@@ -138,28 +145,29 @@
 }
 function spawnFallingObject() {
 	var lane = Math.floor(Math.random() * 7);
 	var x = lanePositions[lane];
+	var spawnY = 150; // Spawn from bottom of tunnel
 	if (Math.random() < shieldSpawnChance) {
 		// Spawn shield powerup
 		var shield = new ShieldPowerup(lane);
 		shield.x = x;
-		shield.y = -50;
+		shield.y = spawnY;
 		shieldPowerups.push(shield);
 		game.addChild(shield);
 	} else if (Math.random() < bombSpawnChance) {
 		// Spawn bomb
 		var bomb = new FallingBomb(lane);
 		bomb.x = x;
-		bomb.y = -50;
+		bomb.y = spawnY;
 		fallingBombs.push(bomb);
 		game.addChild(bomb);
 	} else {
 		// Spawn note
 		var noteType = Math.floor(Math.random() * 7) + 1;
 		var note = new FallingNote(noteType, lane);
 		note.x = x;
-		note.y = -50;
+		note.y = spawnY;
 		fallingNotes.push(note);
 		game.addChild(note);
 	}
 }