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

/**** 
* Classes
****/ 
// Obstacle (coral/rock) class
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	// Top or bottom
	self.isTop = false;
	self.passed = false;
	// Attach asset
	var obs = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.0
	});
	// For top obstacles, flip vertically and anchor to bottom
	self.setTop = function () {
		self.isTop = true;
		obs.scaleY = -1;
		obs.anchorY = 1.0;
	};
	// Move left every frame
	self.update = function () {
		self.x -= obstacleSpeed;
	};
	return self;
});
// Penguin class
var Penguin = Container.expand(function () {
	var self = Container.call(this);
	var penguinSprite = self.attachAsset('penguin', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocity = 0;
	self.gravity = 1.1; // Halved for 50% slower fall
	self.lift = -24; // Halved for 50% slower upward movement
	self.maxFall = 18; // Halved for 50% slower max fall speed
	self.alive = true;
	// Flap animation
	self.flap = function () {
		if (!self.alive) return;
		self.velocity = self.lift;
		// Animate penguin up a bit
		tween(self, {
			rotation: -0.35
		}, {
			duration: 120,
			easing: tween.cubicOut
		});
	};
	// Call every frame
	self.update = function () {
		if (!self.alive) return;
		self.velocity += self.gravity;
		if (self.velocity > self.maxFall) self.velocity = self.maxFall;
		self.y += self.velocity;
		// Rotate penguin based on velocity
		var targetRot = Math.max(-0.4, Math.min(0.7, self.velocity / 50));
		tween(self, {
			rotation: targetRot
		}, {
			duration: 120,
			easing: tween.linear
		});
	};
	// On death
	self.die = function () {
		self.alive = false;
		tween(self, {
			rotation: 1.2
		}, {
			duration: 400,
			easing: tween.cubicIn
		});
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x6ec6f7
});

/**** 
* Game Code
****/ 
// Background (ocean blue, for parallax effect)
// Sea floor/ceiling
// Obstacle (coral/rock) - top and bottom
// Penguin (player)
// Game constants
var GAP_SIZE = 420; // Gap between top and bottom obstacles
var OBSTACLE_INTERVAL = 120; // Frames between obstacles (doubled for 50% slower spawn)
var obstacleSpeed = 9; // Halved for 50% slower movement
var penguinStartX = 600;
var penguinStartY = 1366;
var floorY = 2732 - 80;
var ceilingY = 80;
// Background
var bg = LK.getAsset('bgwave', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 0
});
game.addChild(bg);
// Sea floor
var floor = LK.getAsset('seabound', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: floorY
});
game.addChild(floor);
// Sea ceiling
var ceiling = LK.getAsset('seabound', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 0
});
game.addChild(ceiling);
// Penguin
var penguin = new Penguin();
penguin.x = penguinStartX;
penguin.y = penguinStartY;
game.addChild(penguin);
// Obstacles array
var obstacles = [];
// Score
var score = 0;
var scoreTxt = new Text2('0', {
	size: 150,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Drag/tap handler
var gameStarted = false;
var gameOver = false;
// Start the game on first tap
function startGame() {
	if (!gameStarted) {
		gameStarted = true;
	}
	penguin.flap();
}
// Touch/click events
game.down = function (x, y, obj) {
	if (gameOver) return;
	startGame();
};
// No drag, so no move/up needed
// Main update loop
game.update = function () {
	if (gameOver) return;
	// Penguin physics
	penguin.update();
	// Prevent penguin from going off top/ceiling
	if (penguin.y - 60 < ceilingY) {
		penguin.y = ceilingY + 60;
		penguin.velocity = 0;
	}
	// Prevent penguin from going below floor
	if (penguin.y + 60 > floorY) {
		penguin.y = floorY - 60;
		penguin.velocity = 0;
		penguin.die();
		endGame();
		return;
	}
	// Spawn obstacles as pairs: one from the top, one from the bottom, with a gap in between
	if (gameStarted && LK.ticks % OBSTACLE_INTERVAL === 0) {
		// Randomize the vertical position of the gap
		var minGapY = ceilingY + 200 + GAP_SIZE / 2;
		var maxGapY = floorY - 200 - GAP_SIZE / 2;
		var gapY = Math.floor(minGapY + Math.random() * (maxGapY - minGapY));
		// Top obstacle
		var topObs = new Obstacle();
		topObs.setTop();
		topObs.x = 2048 + 90;
		topObs.y = gapY - GAP_SIZE / 2;
		obstacles.push(topObs);
		game.addChild(topObs);
		// Bottom obstacle
		var botObs = new Obstacle();
		botObs.x = 2048 + 90;
		botObs.y = gapY + GAP_SIZE / 2;
		obstacles.push(botObs);
		game.addChild(botObs);
	}
	// Move and manage obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obs = obstacles[i];
		obs.update();
		// Remove if off screen
		if (obs.x < -200) {
			obs.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Collision with penguin
		if (penguin.alive && penguin.intersects(obs)) {
			penguin.die();
			endGame();
			return;
		}
		// Score: Only count bottom obstacles, and only once per pair
		if (!obs.isTop && !obs.passed && obs.x + 90 < penguin.x) {
			obs.passed = true;
			score += 1;
			scoreTxt.setText(score);
		}
	}
};
// End game
function endGame() {
	gameOver = true;
	// Flash red
	LK.effects.flashScreen(0xff0000, 800);
	// Show game over popup
	LK.setTimeout(function () {
		LK.showGameOver();
	}, 800);
}

===================================================================
--- original.js
+++ change.js
@@ -16,9 +16,9 @@
 	var obs = self.attachAsset('obstacle', {
 		anchorX: 0.5,
 		anchorY: 0.0
 	});
-	// For top obstacles, flip vertically
+	// For top obstacles, flip vertically and anchor to bottom
 	self.setTop = function () {
 		self.isTop = true;
 		obs.scaleY = -1;
 		obs.anchorY = 1.0;
@@ -175,11 +175,14 @@
 		penguin.die();
 		endGame();
 		return;
 	}
-	// Spawn obstacles
+	// Spawn obstacles as pairs: one from the top, one from the bottom, with a gap in between
 	if (gameStarted && LK.ticks % OBSTACLE_INTERVAL === 0) {
-		var gapY = Math.floor(ceilingY + 200 + Math.random() * (floorY - ceilingY - GAP_SIZE - 400));
+		// Randomize the vertical position of the gap
+		var minGapY = ceilingY + 200 + GAP_SIZE / 2;
+		var maxGapY = floorY - 200 - GAP_SIZE / 2;
+		var gapY = Math.floor(minGapY + Math.random() * (maxGapY - minGapY));
 		// Top obstacle
 		var topObs = new Obstacle();
 		topObs.setTop();
 		topObs.x = 2048 + 90;