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

/**** 
* Classes
****/ 
// Ninja class
var Ninja = Container.expand(function () {
	var self = Container.call(this);
	var ninjaAsset = self.attachAsset('ninja', {
		anchorX: 0.5,
		anchorY: 1
	});
	// Physics
	self.vy = 0;
	self.isJumping = false;
	// Update method for gravity and jump
	self.update = function () {
		if (!self.isJumping) return;
		self.y += self.vy;
		self.vy += gravity;
		// Land on ground
		if (self.y >= groundY) {
			self.y = groundY;
			self.vy = 0;
			self.isJumping = false;
		}
	};
	// Jump method
	self.jump = function () {
		if (!self.isJumping) {
			self.vy = jumpVelocity;
			self.isJumping = true;
		}
	};
	return self;
});
// Obstacle class
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obsAsset = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 1
	});
	self.passed = false; // For scoring
	// Update method for moving left
	self.update = function () {
		self.x -= obstacleSpeed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0xf0f0f0
});

/**** 
* Game Code
****/ 
// Ground: a box, green
// Obstacle: a box, gray
// Ninja character: a box, dark blue
// Constants
var groundY = 2400; // Y position of ground top
var gravity = 3.2; // Gravity per frame (slower fall)
var jumpVelocity = -60; // Initial jump velocity (slower jump)
var obstacleSpeed = 16; // Obstacle speed per frame (slower obstacles)
var obstacleMinGap = 700; // Minimum distance between obstacles (slightly more space)
var obstacleMaxGap = 1100; // Maximum distance between obstacles (slightly more space)
// Game state
var ninja;
var ground;
var obstacles = [];
var score = 0;
var scoreTxt;
var gameStarted = false;
var lastObstacleX = 0;
// Add ground
ground = LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0
});
ground.x = 0;
ground.y = groundY;
game.addChild(ground);
// Add ninja
ninja = new Ninja();
ninja.x = 420;
ninja.y = groundY;
game.addChild(ninja);
// Score text
scoreTxt = new Text2('0', {
	size: 120,
	fill: "#222"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Helper: spawn obstacle
function spawnObstacle() {
	var obs = new Obstacle();
	obs.x = 2048 + 100;
	obs.y = groundY;
	obstacles.push(obs);
	game.addChild(obs);
	lastObstacleX = obs.x;
}
// Helper: reset game state
function resetGame() {
	// Remove obstacles
	for (var i = 0; i < obstacles.length; i++) {
		obstacles[i].destroy();
	}
	obstacles = [];
	// Reset ninja
	ninja.x = 420;
	ninja.y = groundY;
	ninja.vy = 0;
	ninja.isJumping = false;
	// Reset score
	score = 0;
	scoreTxt.setText(score);
	// Reset obstacle spawn
	lastObstacleX = 0;
	// Spawn first obstacle
	spawnObstacle();
	gameStarted = true;
}
// Start game on first tap
game.down = function (x, y, obj) {
	if (!gameStarted) {
		resetGame();
		ninja.jump();
		return;
	}
	// Only jump if not already jumping
	ninja.jump();
};
// Main update loop
game.update = function () {
	if (!gameStarted) return;
	// Update ninja
	ninja.update();
	// Update obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obs = obstacles[i];
		obs.update();
		// Check for collision
		if (ninja.intersects(obs)) {
			// Flash screen and game over
			LK.effects.flashScreen(0xff0000, 800);
			LK.showGameOver();
			gameStarted = false;
			return;
		}
		// Scoring: passed obstacle
		if (!obs.passed && obs.x + 60 < ninja.x) {
			obs.passed = true;
			score += 1;
			scoreTxt.setText(score);
		}
		// Remove off-screen obstacles
		if (obs.x < -200) {
			obs.destroy();
			obstacles.splice(i, 1);
		}
	}
	// Spawn new obstacles
	if (obstacles.length === 0 || 2048 - lastObstacleX > obstacleMinGap + Math.floor(Math.random() * (obstacleMaxGap - obstacleMinGap))) {
		spawnObstacle();
	}
};
// On game over, allow restart on tap
game.up = function (x, y, obj) {
	if (!gameStarted) {
		// Wait for LK.showGameOver to reset game
	}
};
// Initial state: show "Tap to Start"
gameStarted = false;
scoreTxt.setText('0');

===================================================================
--- original.js
+++ change.js
@@ -66,13 +66,13 @@
 // Obstacle: a box, gray
 // Ninja character: a box, dark blue
 // Constants
 var groundY = 2400; // Y position of ground top
-var gravity = 5.2; // Gravity per frame
-var jumpVelocity = -90; // Initial jump velocity
-var obstacleSpeed = 28; // Obstacle speed per frame
-var obstacleMinGap = 600; // Minimum distance between obstacles
-var obstacleMaxGap = 950; // Maximum distance between obstacles
+var gravity = 3.2; // Gravity per frame (slower fall)
+var jumpVelocity = -60; // Initial jump velocity (slower jump)
+var obstacleSpeed = 16; // Obstacle speed per frame (slower obstacles)
+var obstacleMinGap = 700; // Minimum distance between obstacles (slightly more space)
+var obstacleMaxGap = 1100; // Maximum distance between obstacles (slightly more space)
 // Game state
 var ninja;
 var ground;
 var obstacles = [];