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

/**** 
* Classes
****/ 
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdGraphics = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocity = 0;
	self.gravity = 0.5;
	self.flapPower = -10;
	self.maxFallSpeed = 10;
	self.rotation = 0;
	self.flap = function () {
		self.velocity = self.flapPower;
		LK.getSound('flap').play();
		// Animate bird flap
		tween(birdGraphics, {
			rotation: -0.3
		}, {
			duration: 150,
			easing: tween.easeOut
		});
		tween(birdGraphics, {
			rotation: 0
		}, {
			duration: 300,
			easing: tween.easeInOut
		});
	};
	self.update = function () {
		// Apply gravity
		self.velocity += self.gravity;
		// Limit fall speed
		if (self.velocity > self.maxFallSpeed) {
			self.velocity = self.maxFallSpeed;
		}
		// Update position
		self.y += self.velocity;
		// Rotate bird based on velocity
		var targetRotation = Math.min(Math.PI / 4, self.velocity * 0.05);
		birdGraphics.rotation = targetRotation;
	};
	return self;
});
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	self.speed = -4;
	self.gapSize = 400;
	self.passed = false;
	var topPipe = self.attachAsset('pipeTop', {
		anchorX: 0.5,
		anchorY: 1
	});
	var bottomPipe = self.attachAsset('pipeBottom', {
		anchorX: 0.5,
		anchorY: 0
	});
	self.setGapPosition = function (gapY) {
		// Position top pipe so it extends from screen top (0) to gap
		// Top pipe anchored at bottom (anchorY: 1), so y position is where bottom edge should be
		topPipe.y = gapY - self.gapSize / 2;
		// Position bottom pipe so it extends from gap to screen bottom (2732)
		// Bottom pipe anchored at top (anchorY: 0), so y position is where top edge should be
		bottomPipe.y = gapY + self.gapSize / 2;
	};
	self.update = function () {
		self.x += self.speed;
	};
	self.checkCollision = function (bird) {
		var birdBounds = {
			x: bird.x - 30,
			y: bird.y - 30,
			width: 60,
			height: 60
		};
		var topPipeBounds = {
			x: self.x - 60,
			y: topPipe.y - 2732,
			width: 120,
			height: 2732
		};
		var bottomPipeBounds = {
			x: self.x - 60,
			y: bottomPipe.y,
			width: 120,
			height: 2732
		};
		return self.intersectsBounds(birdBounds, topPipeBounds) || self.intersectsBounds(birdBounds, bottomPipeBounds);
	};
	self.intersectsBounds = function (a, b) {
		return a.x < b.x + b.width && a.x + a.width > b.x && a.y < b.y + b.height && a.y + a.height > b.y;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87CEEB
});

/**** 
* Game Code
****/ 
// Game state
var gameStarted = false;
var bird;
var pipes = [];
var ground;
var pipeSpawnTimer = 0;
var pipeSpawnDelay = 120; // 2 seconds at 60fps
var currentBackgroundLevel = 0;
var background;
// Create background
background = game.addChild(LK.getAsset('background1', {
	anchorX: 0,
	anchorY: 0
}));
background.x = 0;
background.y = 0;
// Create bird
bird = game.addChild(new Bird());
bird.x = 400;
bird.y = 1366; // Center of screen
// Create ground
ground = game.addChild(LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0
}));
ground.x = 0;
ground.y = 2732 - 100;
// Set initial score to 19 for testing purposes
LK.setScore(19);
// Create score display
var scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
scoreTxt.y = 100;
// Create instruction text
var instructionTxt = new Text2('TAP TO FLY', {
	size: 80,
	fill: 0xFFFFFF
});
instructionTxt.anchor.set(0.5, 0.5);
game.addChild(instructionTxt);
instructionTxt.x = 1024;
instructionTxt.y = 800;
// Spawn pipe function
function spawnPipe() {
	var pipe = new Pipe();
	var minY = 600;
	var maxY = 2132;
	var totalRange = maxY - minY;
	var currentScore = LK.getScore();
	var randomnessMultiplier;
	// Adjust randomness based on score
	if (currentScore < 50) {
		// Early game: 4-5% less extreme (reduce range by ~20-25%)
		randomnessMultiplier = 0.75;
	} else {
		// Late game (50+): 2-3% more extreme but 1% easier to prevent impossible pipes
		randomnessMultiplier = 1.14;
	}
	var adjustedRange = totalRange * randomnessMultiplier;
	var rangeOffset = (totalRange - adjustedRange) / 2;
	var adjustedMinY = minY + rangeOffset;
	var adjustedMaxY = maxY - rangeOffset;
	var gapY = adjustedMinY + Math.random() * adjustedRange;
	pipe.setGapPosition(gapY);
	pipe.x = 2048 + 60;
	pipes.push(pipe);
	game.addChild(pipe);
}
// Game input handling
game.down = function (x, y, obj) {
	if (!gameStarted) {
		gameStarted = true;
		instructionTxt.visible = false;
		spawnPipe();
	}
	bird.flap();
};
// Main game loop
game.update = function () {
	if (!gameStarted) return;
	// Update bird
	bird.update();
	// Check bird boundaries
	if (bird.y <= 0 || bird.y >= ground.y - 30) {
		// Hit ceiling or ground
		LK.getSound('hit').play();
		LK.showGameOver();
		return;
	}
	// Spawn pipes
	pipeSpawnTimer++;
	if (pipeSpawnTimer >= pipeSpawnDelay) {
		spawnPipe();
		pipeSpawnTimer = 0;
	}
	// Update pipes
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		pipe.update();
		// Check collision
		if (pipe.checkCollision(bird)) {
			LK.getSound('hit').play();
			LK.showGameOver();
			return;
		}
		// Check if bird passed pipe
		if (!pipe.passed && bird.x > pipe.x) {
			pipe.passed = true;
			LK.setScore(LK.getScore() + 1);
			scoreTxt.setText(LK.getScore());
			LK.getSound('score').play();
			// Change background every 20 points
			var newBackgroundLevel = Math.floor(LK.getScore() / 20) % 5;
			if (newBackgroundLevel !== currentBackgroundLevel) {
				currentBackgroundLevel = newBackgroundLevel;
				var backgroundAssets = ['background1', 'background2', 'background3', 'background4', 'background5'];
				background.destroy();
				background = game.addChild(LK.getAsset(backgroundAssets[currentBackgroundLevel], {
					anchorX: 0,
					anchorY: 0
				}));
				background.x = 0;
				background.y = 0;
				// Move background to back
				game.setChildIndex(background, 0);
			}
		}
		// Remove pipes that are off screen
		if (pipe.x < -120) {
			pipe.destroy();
			pipes.splice(i, 1);
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -136,10 +136,10 @@
 	anchorY: 0
 }));
 ground.x = 0;
 ground.y = 2732 - 100;
-// Set initial score to 0 for normal gameplay
-LK.setScore(0);
+// Set initial score to 19 for testing purposes
+LK.setScore(19);
 // Create score display
 var scoreTxt = new Text2('0', {
 	size: 120,
 	fill: 0xFFFFFF