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

/**** 
* Classes
****/ 
var HitEffect = Container.expand(function () {
	var self = Container.call(this);
	var effectGraphics = self.attachAsset('perfectHit', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.init = function (x, y) {
		self.x = x;
		self.y = y;
		effectGraphics.alpha = 1;
		effectGraphics.scale.x = 0.5;
		effectGraphics.scale.y = 0.5;
		tween(effectGraphics.scale, {
			x: 1.5,
			y: 1.5
		}, {
			duration: 300,
			easing: tween.easeOut
		});
		tween(effectGraphics, {
			alpha: 0
		}, {
			duration: 300,
			onFinish: function onFinish() {
				self.destroy();
			}
		});
	};
	return self;
});
var MusicNote = Container.expand(function () {
	var self = Container.call(this);
	var noteGraphics = self.attachAsset('musicNote', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 8;
	self.lane = 0;
	self.isPerfect = false;
	self.lastY = 0;
	self.init = function (laneIndex) {
		self.lane = laneIndex;
		self.x = 256 + laneIndex * 512;
		self.y = -100;
		self.lastY = self.y;
		// Random color for each note
		var colors = [0xff1493, 0x00ff00, 0xffff00, 0xff4500];
		noteGraphics.tint = colors[Math.floor(Math.random() * colors.length)];
	};
	self.update = function () {
		self.lastY = self.y;
		self.y += self.speed;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
game.setBackgroundColor(0x1a1a2e);
var notes = [];
var score = 0;
var combo = 0;
var maxCombo = 0;
var hitZoneY = 2200;
var noteSpawnTimer = 0;
var gameStarted = false;
// Fever mode variables
var feverActive = false;
var feverGauge = 0;
var feverGaugeMax = 1000;
var feverTimer = 0;
var feverBar = null;
var feverBarBg = null;
// Create hit zone
var hitZone = game.addChild(LK.getAsset('hitZone', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 1024,
	y: hitZoneY,
	alpha: 0.3
}));
// Score display
var scoreTxt = new Text2('Score: 0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Combo display
var comboTxt = new Text2('Combo: 0', {
	size: 60,
	fill: 0xFFFF00
});
comboTxt.anchor.set(0.5, 0);
comboTxt.y = 100;
LK.gui.top.addChild(comboTxt);
// Instructions
var instructionTxt = new Text2('Tap the notes when they reach the blue zone!', {
	size: 50,
	fill: 0xFFFFFF
});
instructionTxt.anchor.set(0.5, 0.5);
LK.gui.center.addChild(instructionTxt);
// Fever Bar UI
feverBarBg = new Text2('', {
	size: 1,
	fill: 0x000000
});
feverBarBg.width = 600;
feverBarBg.height = 40;
feverBarBg.x = 1024 - 300;
feverBarBg.y = 180;
feverBarBg.alpha = 0.4;
LK.gui.top.addChild(feverBarBg);
feverBar = new Text2('', {
	size: 1,
	fill: 0xffd700
});
feverBar.width = 0;
feverBar.height = 40;
feverBar.x = 1024 - 300;
feverBar.y = 180;
feverBar.alpha = 0.8;
LK.gui.top.addChild(feverBar);
var feverTxt = new Text2('FEVER', {
	size: 40,
	fill: 0xffd700
});
feverTxt.anchor.set(0.5, 0.5);
feverTxt.x = 1024;
feverTxt.y = 200;
LK.gui.top.addChild(feverTxt);
// Start game after 2 seconds
LK.setTimeout(function () {
	instructionTxt.visible = false;
	gameStarted = true;
	LK.playMusic('gameMusic');
}, 2000);
// Touch handler
game.down = function (x, y, obj) {
	if (!gameStarted) return;
	// Determine which lane was tapped
	var lane = Math.floor(x / 512);
	if (lane > 3) lane = 3;
	// Check for hit
	var hitNote = false;
	for (var i = notes.length - 1; i >= 0; i--) {
		var note = notes[i];
		if (note.lane === lane && Math.abs(note.y - hitZoneY) < 180) {
			// Hit!
			hitNote = true;
			var baseScore = 100;
			combo++;
			if (combo > maxCombo) maxCombo = combo;
			// Perfect hit bonus
			if (Math.abs(note.y - hitZoneY) < 30) {
				baseScore += 50;
				var effect = game.addChild(new HitEffect());
				effect.init(note.x, note.y);
				// Increase fever gauge on perfect
				feverGauge += 120;
				if (feverGauge > feverGaugeMax) feverGauge = feverGaugeMax;
			} else {
				feverGauge += 40;
				if (feverGauge > feverGaugeMax) feverGauge = feverGaugeMax;
			}
			// Bonus note
			if (note.isBonus) {
				baseScore += 100;
			}
			// Long note
			if (note.isLong && Math.abs(note.y - hitZoneY) < 30) {
				baseScore += 100;
			}
			// Fever mode bonus
			if (feverActive) {
				baseScore *= 2;
			}
			score += baseScore;
			LK.getSound('hitSound').play();
			// Flash the note before destroying
			LK.effects.flashObject(note, 0xffffff, 200);
			LK.setTimeout(function () {
				note.destroy();
			}, 200);
			notes.splice(i, 1);
			break;
		}
	}
	if (!hitNote) {
		// Miss!
		combo = 0;
		LK.getSound('missSound').play();
		LK.effects.flashScreen(0xff0000, 200);
	}
	// Update UI
	scoreTxt.setText('Score: ' + score);
	comboTxt.setText('Combo: ' + combo);
	// Win condition
	if (score >= 5000) {
		feverActive = false;
		feverGauge = 0;
		feverTimer = 0;
		feverBar.width = 0;
		hitZone.alpha = 0.3;
		LK.showYouWin();
	}
};
// Game update loop
game.update = function () {
	if (!gameStarted) return;
	// Spawn notes
	noteSpawnTimer++;
	if (noteSpawnTimer > 45) {
		noteSpawnTimer = 0;
		var laneIdx = Math.floor(Math.random() * 4);
		var note = game.addChild(new MusicNote());
		note.init(laneIdx);
		// 10% chance to spawn a bonus note (worth more points)
		if (Math.random() < 0.1) {
			note.isBonus = true;
			note.attachAsset('perfectHit', {
				anchorX: 0.5,
				anchorY: 0.5,
				x: 0,
				y: 0,
				alpha: 0.3
			});
			note.speed = 10;
		}
		// 10% chance to spawn a long note (slower, worth more if hit perfectly)
		if (Math.random() < 0.1) {
			note.isLong = true;
			note.speed = 4;
		}
		notes.push(note);
	}
	// Check for missed notes
	for (var i = notes.length - 1; i >= 0; i--) {
		var note = notes[i];
		// Check if note passed the hit zone
		if (note.lastY <= hitZoneY + 180 && note.y > hitZoneY + 180) {
			// Missed!
			combo = 0;
			LK.getSound('missSound').play();
			comboTxt.setText('Combo: ' + combo);
		}
		// Remove notes that are off screen
		if (note.y > 2832) {
			note.destroy();
			notes.splice(i, 1);
		}
	}
	// Fever mode logic
	if (feverActive) {
		feverTimer--;
		feverGauge -= 2;
		if (feverGauge < 0) feverGauge = 0;
		// Add a pulsing effect to the hit zone during fever
		hitZone.alpha = 0.5 + 0.2 * Math.sin(LK.ticks / 5);
		if (feverTimer <= 0 || feverGauge <= 0) {
			feverActive = false;
			feverTimer = 0;
			hitZone.alpha = 0.3;
			// End fever visual
			LK.effects.flashScreen(0x1a1a2e, 400);
		}
	} else if (feverGauge >= feverGaugeMax) {
		feverActive = true;
		feverTimer = 360; // 6 seconds at 60fps
		// Fever visual
		LK.effects.flashScreen(0xffd700, 400);
		hitZone.alpha = 0.7;
	}
	// Update fever bar UI
	feverBar.width = Math.floor(feverGauge / feverGaugeMax * 600);
	// Game over if too many misses
	if (notes.length > 10) {
		feverActive = false;
		feverGauge = 0;
		feverTimer = 0;
		feverBar.width = 0;
		hitZone.alpha = 0.3;
		LK.showGameOver();
	}
};

===================================================================
--- original.js
+++ change.js
@@ -161,9 +161,9 @@
 	// Check for hit
 	var hitNote = false;
 	for (var i = notes.length - 1; i >= 0; i--) {
 		var note = notes[i];
-		if (note.lane === lane && Math.abs(note.y - hitZoneY) < 100) {
+		if (note.lane === lane && Math.abs(note.y - hitZoneY) < 180) {
 			// Hit!
 			hitNote = true;
 			var baseScore = 100;
 			combo++;
@@ -254,9 +254,9 @@
 	// Check for missed notes
 	for (var i = notes.length - 1; i >= 0; i--) {
 		var note = notes[i];
 		// Check if note passed the hit zone
-		if (note.lastY <= hitZoneY + 100 && note.y > hitZoneY + 100) {
+		if (note.lastY <= hitZoneY + 180 && note.y > hitZoneY + 180) {
 			// Missed!
 			combo = 0;
 			LK.getSound('missSound').play();
 			comboTxt.setText('Combo: ' + combo);