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

/**** 
* Classes
****/ 
// Bird class
var Bird = Container.expand(function () {
	var self = Container.call(this);
	self.speed = 0;
	self.dir = 1; // 1 = right, -1 = left
	self.isActive = true;
	var bird = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		if (!self.isActive) return;
		self.x += self.speed * self.dir;
	};
	self.crash = function () {
		if (!self.isActive) return;
		self.isActive = false;
		LK.getSound('bird_hit').play();
		tween(self, {
			alpha: 0
		}, {
			duration: 400,
			onFinish: function onFinish() {
				self.visible = false;
			}
		});
	};
	return self;
});
// Kite class
var Kite = Container.expand(function () {
	var self = Container.call(this);
	self.speed = 0;
	self.dir = 1;
	self.isActive = true;
	var kite = self.attachAsset('kite', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		if (!self.isActive) return;
		self.x += self.speed * self.dir;
	};
	self.crash = function () {
		if (!self.isActive) return;
		self.isActive = false;
		tween(self, {
			alpha: 0
		}, {
			duration: 400,
			onFinish: function onFinish() {
				self.visible = false;
			}
		});
	};
	return self;
});
// Paratrooper class
var Paratrooper = Container.expand(function () {
	var self = Container.call(this);
	// State: 0 = falling, 1 = parachute open, 2 = landed, 3 = crashed, 4 = rescued
	self.state = 0;
	self.speed = 0;
	self.hasParachute = false;
	self.isActive = true;
	// Attach body
	var body = self.attachAsset('paratrooper_body', {
		anchorX: 0.5,
		anchorY: 0.0
	});
	body.y = 0;
	// Attach parachute (hidden at first)
	var chute = self.attachAsset('parachute', {
		anchorX: 0.5,
		anchorY: 1.0,
		y: 0
	});
	chute.visible = false;
	// For tap detection
	self.down = function (x, y, obj) {
		if (self.state === 0 && self.isActive) {
			self.openParachute();
		}
	};
	// Open parachute
	self.openParachute = function () {
		if (self.state !== 0) return;
		self.state = 1;
		self.hasParachute = true;
		chute.visible = true;
		// Slow down
		self.speed = self.speed * 0.28;
		// Animate parachute pop
		chute.scaleY = 0.1;
		tween(chute, {
			scaleY: 1
		}, {
			duration: 200,
			easing: tween.bounceOut
		});
		LK.getSound('parachute_open').play();
	};
	// Crash animation
	self.crash = function () {
		if (!self.isActive) return;
		self.isActive = false;
		self.state = 3;
		// Flash red
		LK.effects.flashObject(self, 0xff0000, 600);
		LK.getSound('crash').play();
		// Fade out
		tween(self, {
			alpha: 0
		}, {
			duration: 600,
			onFinish: function onFinish() {
				self.visible = false;
			}
		});
	};
	// Rescue animation
	self.rescue = function () {
		if (!self.isActive) return;
		self.isActive = false;
		self.state = 4;
		// Flash green
		LK.effects.flashObject(self, 0x00ff00, 400);
		// Fade out
		tween(self, {
			alpha: 0
		}, {
			duration: 400,
			onFinish: function onFinish() {
				self.visible = false;
			}
		});
	};
	// Bird/kite collision
	self.hitHazard = function () {
		if (self.state === 0 && self.isActive) {
			self.crash();
		}
	};
	self.update = function () {
		if (!self.isActive) return;
		self.y += self.speed;
	};
	return self;
});
// Plane class (for visual, not interactive)
var Plane = Container.expand(function () {
	var self = Container.call(this);
	var plane = self.attachAsset('plane', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87ceeb // Sky blue
});

/**** 
* Game Code
****/ 
// Paratrooper body (box), parachute (ellipse), bird (ellipse), kite (box), ground (box), plane (box)
// Game constants
var GAME_WIDTH = 2048;
var GAME_HEIGHT = 2732;
var GROUND_HEIGHT = 60;
var LEVELS = 20;
// Level config: Each level increases paratroopers, speed, and hazards
var levelConfigs = [];
for (var i = 0; i < LEVELS; i++) {
	// Level 1: 10 paratroopers, then +2 per level
	var paratroopersToRescue = 10 + i * 2;
	// Level duration: 1 minute (60 seconds * 60 FPS = 3600 ticks)
	var levelDurationTicks = 60 * 60;
	// Calculate spawn interval so all paratroopers spawn within the level duration
	var spawnInterval = Math.floor(levelDurationTicks / paratroopersToRescue);
	// Clamp spawnInterval to a minimum of 10 ticks for high levels
	spawnInterval = Math.max(spawnInterval, 10);
	levelConfigs.push({
		paratroopers: paratroopersToRescue,
		speed: 9 + i * 1.2,
		hazards: i < 3 ? 0 : Math.min(1 + Math.floor((i - 2) / 2), 4),
		hazardSpeed: 7 + i * 0.7,
		hazardTypes: i < 6 ? ['bird'] : i < 12 ? ['bird', 'kite'] : ['bird', 'kite'],
		spawnInterval: spawnInterval,
		levelDurationTicks: levelDurationTicks
	});
}
// State
var currentLevel = 1;
var bestLevel = storage.bestLevel || 1;
var paratroopers = [];
var hazards = [];
var rescuedCount = 0;
var lostCount = 0;
var totalToRescue = 0;
var isLevelActive = false;
var plane = null;
var ground = null;
var levelText = null;
var rescuedText = null;
var lostText = null;
var bestLevelText = null;
var levelTimeout = null;
var spawnTick = 0;
var hazardTick = 0;
var dragNode = null;
// Add ground
ground = LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: GAME_HEIGHT - GROUND_HEIGHT
});
game.addChild(ground);
// Add level text
levelText = new Text2('Level 1', {
	size: 90,
	fill: 0xFFFFFF
});
levelText.anchor.set(0.5, 0);
LK.gui.top.addChild(levelText);
// Add rescued/lost text
rescuedText = new Text2('Rescued: 0', {
	size: 70,
	fill: 0xFFFFFF
});
rescuedText.anchor.set(0, 0);
LK.gui.top.addChild(rescuedText);
lostText = new Text2('Lost: 0', {
	size: 70,
	fill: 0xFF4444
});
lostText.anchor.set(1, 0);
LK.gui.topRight.addChild(lostText);
// Add best level text
bestLevelText = new Text2('Best: ' + bestLevel, {
	size: 60,
	fill: 0xFFFF00
});
bestLevelText.anchor.set(0.5, 0);
LK.gui.bottom.addChild(bestLevelText);
// Start music
LK.playMusic('bgmusic');
// Show level number before starting, wait for tap to begin
function showLevelIntro(level, callback) {
	// Hide timer and texts if visible
	if (levelTimerText) levelTimerText.visible = false;
	levelText.setText('Level ' + level);
	levelText.alpha = 1;
	levelText.visible = true;
	// Overlay to block input except tap to continue
	var introOverlay = new Container();
	introOverlay.interactive = true;
	introOverlay.hitArea = {
		x: 0,
		y: 0,
		width: GAME_WIDTH,
		height: GAME_HEIGHT
	};
	// Add a "Tap to Start" text
	var tapText = new Text2('Tap to Start', {
		size: 100,
		fill: 0xffffff
	});
	tapText.anchor.set(0.5, 0.5);
	tapText.x = GAME_WIDTH / 2;
	tapText.y = GAME_HEIGHT / 2 + 180;
	introOverlay.addChild(tapText);
	// Add overlay to game
	game.addChild(introOverlay);
	// Only allow tap after a short delay to avoid accidental skip
	var canTap = false;
	LK.setTimeout(function () {
		canTap = true;
	}, 400);
	introOverlay.down = function () {
		if (!canTap) return;
		// Animate out
		tween(levelText, {
			alpha: 0
		}, {
			duration: 400
		});
		tween(tapText, {
			alpha: 0
		}, {
			duration: 400
		});
		LK.setTimeout(function () {
			introOverlay.destroy();
			if (callback) callback();
		}, 420);
	};
}
// Start first level after intro
showLevelIntro(currentLevel, function () {
	startLevel(currentLevel);
});
var levelTimerText = null;
var levelTimerTimeout = null;
function startLevel(level) {
	// Update best level if needed
	if (level > bestLevel) {
		bestLevel = level;
		storage.bestLevel = bestLevel;
		if (bestLevelText) bestLevelText.setText('Best: ' + bestLevel);
	}
	// Reset state
	for (var i = 0; i < paratroopers.length; i++) {
		paratroopers[i].destroy();
	}
	for (var i = 0; i < hazards.length; i++) {
		hazards[i].destroy();
	}
	paratroopers = [];
	hazards = [];
	rescuedCount = 0;
	lostCount = 0;
	isLevelActive = true;
	spawnTick = 0;
	hazardTick = 0;
	totalToRescue = levelConfigs[level - 1].paratroopers;
	levelText.setText('Level ' + level);
	rescuedText.setText('Rescued: 0');
	lostText.setText('Lost: 0');
	// Animate level text
	levelText.alpha = 1;
	tween(levelText, {
		alpha: 0
	}, {
		duration: 1200
	});
	// Plane flyby
	if (plane) plane.destroy();
	plane = new Plane();
	plane.y = 180;
	plane.x = -200;
	game.addChild(plane);
	tween(plane, {
		x: GAME_WIDTH + 200
	}, {
		duration: 1800,
		easing: tween.linear,
		onFinish: function onFinish() {
			plane.destroy();
			plane = null;
		}
	});
	// Add or reset timer text
	if (!levelTimerText) {
		levelTimerText = new Text2('01:00', {
			size: 80,
			fill: 0xFFFFFF
		});
		levelTimerText.anchor.set(0.5, 0);
		LK.gui.top.addChild(levelTimerText);
	}
	// Place timer below level text
	levelTimerText.y = levelText.height + 10;
	levelTimerText.setText('01:00');
	// Clear any previous timer
	if (levelTimerTimeout) {
		LK.clearTimeout(levelTimerTimeout);
		levelTimerTimeout = null;
	}
	// Start timer countdown
	var ticksLeft = levelConfigs[level - 1].levelDurationTicks;
	if (levelTimerText) levelTimerText.visible = true;
	function updateTimer() {
		if (!isLevelActive) return;
		ticksLeft--;
		var seconds = Math.floor(ticksLeft / 60);
		var ms = ticksLeft % 60;
		var timeStr = (seconds < 10 ? '0' : '') + seconds + ':' + (ms < 10 ? '0' : '') + ms;
		if (levelTimerText) levelTimerText.setText(timeStr);
		if (ticksLeft > 0 && isLevelActive) {
			levelTimerTimeout = LK.setTimeout(updateTimer, 1000 / 60);
		} else if (isLevelActive) {
			// Time's up, end level
			isLevelActive = false;
			// If not all rescued, game over, else win/next
			if (rescuedCount === totalToRescue) {
				LK.getSound('levelup').play();
				if (currentLevel < LEVELS) {
					currentLevel++;
					LK.setTimeout(function () {
						startLevel(currentLevel);
					}, 1200);
				} else {
					LK.showYouWin();
				}
			} else {
				LK.showGameOver();
			}
		}
	}
	updateTimer();
}
// Paratrooper spawn
function spawnParatrooper() {
	var config = levelConfigs[currentLevel - 1];
	var p = new Paratrooper();
	// Random x, avoid edges
	var margin = 120;
	p.x = margin + Math.random() * (GAME_WIDTH - 2 * margin);
	p.y = 220;
	p.speed = config.speed + Math.random() * 2;
	p.state = 0;
	p.hasParachute = false;
	p.isActive = true;
	paratroopers.push(p);
	game.addChild(p);
}
// Hazard spawn
function spawnHazard() {
	var config = levelConfigs[currentLevel - 1];
	var type = config.hazardTypes[Math.floor(Math.random() * config.hazardTypes.length)];
	var h = null;
	var y = 400 + Math.random() * (GAME_HEIGHT - GROUND_HEIGHT - 800);
	var dir = Math.random() < 0.5 ? 1 : -1;
	var speed = config.hazardSpeed + Math.random() * 2;
	var x = dir === 1 ? -100 : GAME_WIDTH + 100;
	if (type === 'bird') {
		h = new Bird();
	} else {
		h = new Kite();
	}
	h.x = x;
	h.y = y;
	h.dir = dir;
	h.speed = speed;
	h.isActive = true;
	hazards.push(h);
	game.addChild(h);
}
// Game move handler (for drag, but not used in this game)
game.move = function (x, y, obj) {
	// No drag in this game
};
// Game down handler (for tap on paratroopers)
game.down = function (x, y, obj) {
	// Find topmost paratrooper under tap
	for (var i = paratroopers.length - 1; i >= 0; i--) {
		var p = paratroopers[i];
		if (p.isActive && p.state === 0 && p.visible) {
			// Check if tap is inside body
			var local = p.toLocal({
				x: x,
				y: y
			});
			var body = p.children[0];
			if (local.x >= body.x - body.width / 2 && local.x <= body.x + body.width / 2 && local.y >= body.y && local.y <= body.y + body.height) {
				p.openParachute();
				break;
			}
		}
	}
};
// Game update
game.update = function () {
	if (!isLevelActive) return;
	var config = levelConfigs[currentLevel - 1];
	// Spawn paratroopers
	if (paratroopers.length < totalToRescue && LK.ticks % config.spawnInterval === 0) {
		spawnParatrooper();
	}
	// Spawn hazards
	if (config.hazards > 0 && hazards.length < config.hazards && LK.ticks % (80 + Math.floor(Math.random() * 40)) === 0) {
		spawnHazard();
	}
	// Update paratroopers
	for (var i = paratroopers.length - 1; i >= 0; i--) {
		var p = paratroopers[i];
		p.update();
		// Check for ground collision
		if (p.isActive && p.y + 90 >= GAME_HEIGHT - GROUND_HEIGHT) {
			if (p.state === 1) {
				// Landed safely
				p.rescue();
				rescuedCount++;
				rescuedText.setText('Rescued: ' + rescuedCount);
			} else if (p.state === 0) {
				// Crashed
				p.crash();
				lostCount++;
				lostText.setText('Lost: ' + lostCount);
				// Flash screen
				LK.effects.flashScreen(0xff0000, 400);
			}
			// Remove after animation
			LK.setTimeout(function (paratrooper) {
				return function () {
					paratrooper.destroy();
				};
			}(p), 700);
			paratroopers.splice(i, 1);
			continue;
		}
		// Check for hazard collision
		for (var j = hazards.length - 1; j >= 0; j--) {
			var h = hazards[j];
			if (h.isActive && p.isActive && p.state === 0 && p.intersects(h)) {
				p.hitHazard();
				h.crash();
				lostCount++;
				lostText.setText('Lost: ' + lostCount);
				LK.effects.flashScreen(0xff0000, 400);
				LK.setTimeout(function (paratrooper) {
					return function () {
						paratrooper.destroy();
					};
				}(p), 700);
				paratroopers.splice(i, 1);
				break;
			}
		}
	}
	// Update hazards
	for (var i = hazards.length - 1; i >= 0; i--) {
		var h = hazards[i];
		h.update();
		// Remove if off screen
		if (h.dir === 1 && h.x > GAME_WIDTH + 120 || h.dir === -1 && h.x < -120) {
			h.destroy();
			hazards.splice(i, 1);
		}
	}
	// Level end condition
	if (rescuedCount + lostCount >= totalToRescue && paratroopers.length === 0) {
		isLevelActive = false;
		if (rescuedCount === totalToRescue) {
			// Level complete
			LK.getSound('levelup').play();
			if (currentLevel < LEVELS) {
				currentLevel++;
				LK.setTimeout(function () {
					startLevel(currentLevel);
				}, 1200);
			} else {
				// Game win
				LK.showYouWin();
			}
		} else {
			// Game over
			LK.showGameOver();
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -175,10 +175,10 @@
 
 /**** 
 * Game Code
 ****/ 
-// Game constants
 // Paratrooper body (box), parachute (ellipse), bird (ellipse), kite (box), ground (box), plane (box)
+// Game constants
 var GAME_WIDTH = 2048;
 var GAME_HEIGHT = 2732;
 var GROUND_HEIGHT = 60;
 var LEVELS = 20;
@@ -258,10 +258,63 @@
 bestLevelText.anchor.set(0.5, 0);
 LK.gui.bottom.addChild(bestLevelText);
 // Start music
 LK.playMusic('bgmusic');
-// Start first level
-startLevel(currentLevel);
+// Show level number before starting, wait for tap to begin
+function showLevelIntro(level, callback) {
+	// Hide timer and texts if visible
+	if (levelTimerText) levelTimerText.visible = false;
+	levelText.setText('Level ' + level);
+	levelText.alpha = 1;
+	levelText.visible = true;
+	// Overlay to block input except tap to continue
+	var introOverlay = new Container();
+	introOverlay.interactive = true;
+	introOverlay.hitArea = {
+		x: 0,
+		y: 0,
+		width: GAME_WIDTH,
+		height: GAME_HEIGHT
+	};
+	// Add a "Tap to Start" text
+	var tapText = new Text2('Tap to Start', {
+		size: 100,
+		fill: 0xffffff
+	});
+	tapText.anchor.set(0.5, 0.5);
+	tapText.x = GAME_WIDTH / 2;
+	tapText.y = GAME_HEIGHT / 2 + 180;
+	introOverlay.addChild(tapText);
+	// Add overlay to game
+	game.addChild(introOverlay);
+	// Only allow tap after a short delay to avoid accidental skip
+	var canTap = false;
+	LK.setTimeout(function () {
+		canTap = true;
+	}, 400);
+	introOverlay.down = function () {
+		if (!canTap) return;
+		// Animate out
+		tween(levelText, {
+			alpha: 0
+		}, {
+			duration: 400
+		});
+		tween(tapText, {
+			alpha: 0
+		}, {
+			duration: 400
+		});
+		LK.setTimeout(function () {
+			introOverlay.destroy();
+			if (callback) callback();
+		}, 420);
+	};
+}
+// Start first level after intro
+showLevelIntro(currentLevel, function () {
+	startLevel(currentLevel);
+});
 var levelTimerText = null;
 var levelTimerTimeout = null;
 function startLevel(level) {
 	// Update best level if needed