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

/**** 
* Classes
****/ 
// Invader class for enemy invaders
var Invader = Container.expand(function () {
	var self = Container.call(this);
	// Use the 'character' asset for invader for now, but tint it green
	var invaderSprite = self.attachAsset('character', {
		anchorX: 0.5,
		anchorY: 0.5,
		tint: 0x00ff00,
		scaleX: 0.7,
		scaleY: 0.7
	});
	self.speedX = 4; // Horizontal speed
	self.speedY = 0; // Vertical speed (drops down on edge)
	self.lastX = self.x;
	self.lastY = self.y;
	self.update = function () {
		// Move horizontally
		self.x += self.speedX;
		// Bounce off left edge
		if (self.lastX >= 60 && self.x < 60) {
			self.x = 60; // Clamp to edge
			self.speedX = -self.speedX * 1.12; // Increase speed and reverse
			// Cap speedX to a maximum of 12 (preserve sign)
			if (self.speedX > 12) self.speedX = 12;
			if (self.speedX < -12) self.speedX = -12;
			self.y += 40; // Move down on bounce
		}
		// Bounce off right edge
		if (self.lastX <= 2048 - 60 && self.x > 2048 - 60) {
			self.x = 2048 - 60; // Clamp to edge
			self.speedX = -self.speedX * 1.12; // Increase speed and reverse
			// Cap speedX to a maximum of 12 (preserve sign)
			if (self.speedX > 12) self.speedX = 12;
			if (self.speedX < -12) self.speedX = -12;
			self.y += 40; // Move down on bounce
		}
		self.lastX = self.x;
		self.lastY = self.y;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// Game state variables
var p1Score = 0;
var p2Score = 0;
// High score tracking (persistent for session)
var highScore = 0;
// Score display Text2 objects
var p1ScoreDisplay, p2ScoreDisplay, highScoreDisplay;
// Helper to show score displays at top
function showScoreDisplays() {
	// Remove previous if any
	if (p1ScoreDisplay) p1ScoreDisplay.alpha = 0;
	if (p2ScoreDisplay) p2ScoreDisplay.alpha = 0;
	if (highScoreDisplay) highScoreDisplay.alpha = 0;
	// High Score
	highScoreDisplay = new Text2('HIGH: ' + highScore, {
		size: 60,
		fill: 0xFFD700 // Gold
	});
	highScoreDisplay.anchor.set(0.5, 0);
	highScoreDisplay.x = 2048 / 2;
	highScoreDisplay.y = 20;
	LK.gui.top.addChild(highScoreDisplay);
	// P1 Score (left)
	p1ScoreDisplay = new Text2('P1: ' + p1Score, {
		size: 50,
		fill: 0xFF4444
	});
	p1ScoreDisplay.anchor.set(0, 0);
	p1ScoreDisplay.x = 120;
	p1ScoreDisplay.y = 20;
	LK.gui.top.addChild(p1ScoreDisplay);
	// P2 Score (right)
	p2ScoreDisplay = new Text2('P2: ' + p2Score, {
		size: 50,
		fill: 0x4444FF
	});
	p2ScoreDisplay.anchor.set(1, 0);
	p2ScoreDisplay.x = 2048 - 120;
	p2ScoreDisplay.y = 20;
	LK.gui.top.addChild(p2ScoreDisplay);
}
// Helper to update score displays
function updateScoreDisplays() {
	if (p1ScoreDisplay) p1ScoreDisplay.setText('P1: ' + p1Score);
	if (p2ScoreDisplay) p2ScoreDisplay.setText('P2: ' + p2Score);
	// High score is always the highest of P1 and P2
	highScore = Math.max(p1Score, p2Score, highScore);
	if (highScoreDisplay) highScoreDisplay.setText('HIGH: ' + highScore);
}
// Red ship for P1
// Blue ship for P2
// Yellow target
var coins = 0;
var maxCoins = 2; // Require 2 credits for 2 players
var gameStarted = false;
var insertCoinText;
var creditsText;
var pressStartText;
var holdStartTime = 0; // Only used for hold-to-skip in ready screen
var isHolding = false; // Only used for hold-to-skip in ready screen
var ship1;
var ship2;
var countdownText;
var countdownTimer;
var gameplayShips = [];
var target;
var target2; // Second target for P2
var cannons = [];
var cannonLines = [];
// Track dragging for both targets independently
var draggingTarget1 = false;
var draggingTarget2 = false;
var isShooting = false;
var isInReadyScreen = false;
// Create main title text "Invader Blits"
var titleText = new Text2('Invader Blits', {
	size: 120,
	fill: 0xFFFFFF
});
titleText.anchor.set(0.5, 0.5);
titleText.x = 2048 / 2;
titleText.y = 2732 / 2 - 50;
game.addChild(titleText);
// Create the "2" text (initially hidden)
var numberText = new Text2('2', {
	size: 120,
	fill: 0xFFFFFF
});
numberText.anchor.set(0.5, 0.5);
numberText.x = 2048 / 2 + titleText.width / 2 + 20; // Position it after "Invader Blits"
numberText.y = 2732 / 2 - 50;
numberText.alpha = 0; // Start invisible
game.addChild(numberText);
// Position the "2" below the screen initially for slide-up animation
numberText.y = 2732 + 100; // Start below screen
numberText.alpha = 1; // Make it visible but positioned off-screen
// Show the "2" after 3 seconds with a slide-up animation
LK.setTimeout(function () {
	tween(numberText, {
		y: 2732 / 2 - 50 // Slide up to final position next to title
	}, {
		duration: 800,
		easing: tween.easeOut
	});
	// After the "2" animation completes, show the INSERT COIN! text
	LK.setTimeout(function () {
		// Create "INSERT COIN!" text
		insertCoinText = new Text2('INSERT COIN!', {
			size: 60,
			fill: 0xFFFF00 // Yellow color
		});
		insertCoinText.anchor.set(0.5, 0.5);
		insertCoinText.x = 2048 / 2;
		insertCoinText.y = 300; // Top of screen
		game.addChild(insertCoinText);
		// Create "0/1 CREDITS" text
		creditsText = new Text2('0/1 CREDITS', {
			size: 40,
			fill: 0xFFFFFF // White color
		});
		creditsText.anchor.set(0.5, 0.5);
		creditsText.x = 2048 / 2;
		creditsText.y = 380; // Below INSERT COIN!
		game.addChild(creditsText);
	}, 800); // Wait for the "2" animation to complete
}, 3000);
// Function to update credits display
function updateCreditsDisplay() {
	if (creditsText) {
		creditsText.setText(coins + '/' + maxCoins + ' CREDITS');
	}
	// (Removed 'PRESS START' text creation for gameplay)
	// Handle target dragging
	game.move = function (x, y, obj) {
		// Allow both targets to be dragged at the same time
		// Use draggingTarget1 and draggingTarget2 to track each target's drag state
		// Move target1 if dragging
		if (draggingTarget1 && target) {
			target.x = x;
			target.y = y;
			// Only update lines for P1 (first two lines)
			for (var i = 0; i < 2 && i < cannons.length; i++) {
				var cannon = cannons[i];
				var line = cannonLines[i];
				var dx = target.x - cannon.x;
				var dy = target.y - cannon.y;
				var distance = Math.sqrt(dx * dx + dy * dy);
				var angle = Math.atan2(dy, dx);
				line.x = cannon.x;
				line.y = cannon.y;
				line.rotation = angle;
				line.scaleX = distance / 100;
			}
		}
		// Move target2 if dragging
		if (draggingTarget2 && typeof target2 !== "undefined" && target2) {
			target2.x = x;
			target2.y = y;
			// Only update lines for P2 (last two lines)
			for (var i = 2; i < cannons.length; i++) {
				var cannon = cannons[i];
				var line = cannonLines[i];
				var dx = target2.x - cannon.x;
				var dy = target2.y - cannon.y;
				var distance = Math.sqrt(dx * dx + dy * dy);
				var angle = Math.atan2(dy, dx);
				line.x = cannon.x;
				line.y = cannon.y;
				line.rotation = angle;
				line.scaleX = distance / 100;
			}
		}
	};
	// Update down handler to include target dragging
	var originalDown = game.down;
	game.down = function (x, y, obj) {
		// Call original down handler first
		originalDown.call(this, x, y, obj);
		// Allow both targets to be picked up for dragging at the same time
		if (gameStarted) {
			// Check if clicking on target1
			if (target) {
				var dx = x - target.x;
				var dy = y - target.y;
				var distance = Math.sqrt(dx * dx + dy * dy);
				if (distance < 60) {
					draggingTarget1 = true;
					// Show lines for P1 cannons only
					for (var i = 0; i < 2 && i < cannonLines.length; i++) {
						cannonLines[i].alpha = 0.8;
					}
				}
			}
			// Check if clicking on target2
			if (typeof target2 !== "undefined" && target2) {
				var dx2 = x - target2.x;
				var dy2 = y - target2.y;
				var distance2 = Math.sqrt(dx2 * dx2 + dy2 * dy2);
				if (distance2 < 60) {
					draggingTarget2 = true;
					// Show lines for P2 cannons only
					for (var i = 2; i < cannonLines.length; i++) {
						cannonLines[i].alpha = 0.8;
					}
				}
			}
		}
	};
	// Update up handler to stop target dragging
	var originalUp = game.up;
	game.up = function (x, y, obj) {
		// Call original up handler first
		originalUp.call(this, x, y, obj);
		// Stop dragging for both targets independently
		if (draggingTarget1) {
			// Hide lines for P1 cannons only
			for (var i = 0; i < 2 && i < cannonLines.length; i++) {
				cannonLines[i].alpha = 0;
			}
			draggingTarget1 = false;
		}
		if (draggingTarget2) {
			// Hide lines for P2 cannons only
			for (var i = 2; i < cannonLines.length; i++) {
				cannonLines[i].alpha = 0;
			}
			draggingTarget2 = false;
		}
	};
	// Function to update cannon lines to point at target
	function updateCannonLines() {
		if (!target && !target2 || !isShooting) return;
		for (var i = 0; i < cannons.length; i++) {
			var cannon = cannons[i];
			var line = cannonLines[i];
			var dx, dy;
			// First two cannons/lines (P1) point to target, last two (P2) to target2
			if (i < 2) {
				dx = target.x - cannon.x;
				dy = target.y - cannon.y;
			} else {
				dx = target2.x - cannon.x;
				dy = target2.y - cannon.y;
			}
			var distance = Math.sqrt(dx * dx + dy * dy);
			var angle = Math.atan2(dy, dx);
			line.x = cannon.x;
			line.y = cannon.y;
			line.rotation = angle;
			line.scaleX = distance / 100; // Adjust line length
		}
	}
	// Add shooting functionality
	game.update = function () {
		// Lines are now controlled by dragging, not automatic shooting
	};
}
// Touch down event for inserting coins and starting game
game.down = function (x, y, obj) {
	if (gameStarted) {
		// (Handled by new drag logic in the other game.down handler)
		return;
	}
	// If in ready screen (countdown), allow tap to insert coin
	if (isInReadyScreen) {
		// Allow inserting coin during ready screen
		if (coins < maxCoins) {
			coins++;
			updateCreditsDisplay();
			// Hide INSERT COIN text when max coins reached
			if (coins >= maxCoins && insertCoinText) {
				insertCoinText.alpha = 0.3; // Dim it
			}
		}
		// Do NOT skip countdown on tap
		return;
	}
	// Insert coin with tap
	if (coins < maxCoins) {
		coins++;
		updateCreditsDisplay();
		// Hide INSERT COIN text when max coins reached
		if (coins >= maxCoins && insertCoinText) {
			insertCoinText.alpha = 0.3; // Dim it
		}
		// Automatically go to ready screen when credit is added
		if (!isInReadyScreen) {
			startReadyScreen();
		}
		return;
	}
	// Start ready screen immediately when pressing start (no hold)
	// Only allow starting when 2 credits are inserted
	if (coins === maxCoins && !isInReadyScreen) {
		startReadyScreen();
	}
};
// Touch up event to stop holding
game.up = function (x, y, obj) {
	if (gameStarted) {
		// Only allow hold-to-skip during ready screen countdown
		if (isInReadyScreen && countdownTimer && Date.now() - holdStartTime >= 1000) {
			isHolding = false;
			// Skip countdown
			LK.clearInterval(countdownTimer);
			countdownText.setText('GO!');
			LK.setTimeout(function () {
				if (countdownText) countdownText.alpha = 0;
				isInReadyScreen = false;
				// Show player ships after countdown
				showPlayerShips();
				// Start gameplay sequence
				startGameplaySequence();
			}, 500);
		}
		return;
	}
	isHolding = false;
	// No hold-to-start for game; do nothing here except for hold-to-skip in ready screen
};
// Function to start ready screen
function startReadyScreen() {
	gameStarted = true;
	isInReadyScreen = true;
	// Consume one credit when starting
	coins--;
	updateCreditsDisplay();
	// Hide all title screen elements except creditsText (keep creditsText visible in ready screen)
	if (titleText) titleText.alpha = 0;
	if (numberText) numberText.alpha = 0;
	if (insertCoinText) insertCoinText.alpha = 0;
	if (creditsText) creditsText.alpha = 1; // Show creditsText during ready screen
	if (pressStartText) pressStartText.alpha = 0;
	// Make ship2 fully visible (unfade it) only if ship2 exists
	if (ship2) {
		tween(ship2, {
			alpha: 1
		}, {
			duration: 500,
			easing: tween.easeOut
		});
	}
	// Show 15 second countdown
	countdownText = new Text2('15', {
		size: 80,
		fill: 0xFF0000 // Red color
	});
	countdownText.anchor.set(0.5, 0.5);
	countdownText.x = 2048 / 2;
	countdownText.y = 400;
	game.addChild(countdownText);
	// Start countdown timer
	var timeLeft = 15;
	countdownTimer = LK.setInterval(function () {
		timeLeft--;
		if (timeLeft <= 0) {
			LK.clearInterval(countdownTimer);
			countdownText.setText('GO!');
			LK.setTimeout(function () {
				if (countdownText) countdownText.alpha = 0;
				isInReadyScreen = false;
				// Show player ships after countdown
				showPlayerShips();
				// Start gameplay sequence
				startGameplaySequence();
			}, 1000);
		} else {
			countdownText.setText(timeLeft.toString());
		}
	}, 1000);
	// Game would start here - for now just clear screen
	game.setBackgroundColor(0x000020); // Dark blue to show game started
}
// Function to show player ships on ready screen
function showPlayerShips() {
	// Hide the hold-to-start ships
	if (ship1) ship1.alpha = 0;
	if (ship2) ship2.alpha = 0;
	// Always show 2-player setup (force 2 players)
	var shipPositions = [{
		x: 100,
		y: 2732 - 100
	}, {
		x: 100,
		y: 2732 - 200
	}, {
		x: 2048 - 100,
		y: 2732 - 100
	}, {
		x: 2048 - 100,
		y: 2732 - 200
	}];
	// Create ships
	for (var i = 0; i < shipPositions.length; i++) {
		var ship = LK.getAsset('character', {
			anchorX: 0.5,
			anchorY: 0.5,
			x: shipPositions[i].x,
			y: shipPositions[i].y,
			scaleX: 0.6,
			scaleY: 0.6
		});
		game.addChild(ship);
	}
}
// Function to start the gameplay sequence
function startGameplaySequence() {
	// Show "Shoot Enemy Ships" text
	var shootText = new Text2('Shoot Enemy Ships', {
		size: 80,
		fill: 0xFFFF00 // Yellow
	});
	shootText.anchor.set(0.5, 0.5);
	shootText.x = 2048 / 2;
	shootText.y = 2732 / 2 - 200;
	game.addChild(shootText);
	// After 2 seconds, show "Ready?"
	LK.setTimeout(function () {
		shootText.alpha = 0;
		var readyText = new Text2('Ready?', {
			size: 100,
			fill: 0x00FF00 // Green
		});
		readyText.anchor.set(0.5, 0.5);
		readyText.x = 2048 / 2;
		readyText.y = 2732 / 2;
		game.addChild(readyText);
		// After 1 more second, show "Go!" and start game
		LK.setTimeout(function () {
			readyText.alpha = 0;
			var goText = new Text2('Go!', {
				size: 120,
				fill: 0xFF0000 // Red
			});
			goText.anchor.set(0.5, 0.5);
			goText.x = 2048 / 2;
			goText.y = 2732 / 2;
			game.addChild(goText);
			// Show "Protect Cannons" with arrows at bottom
			var protectText = new Text2('Protect Cannons', {
				size: 60,
				fill: 0xFFFFFF // White
			});
			protectText.anchor.set(0.5, 0.5);
			protectText.x = 2048 / 2;
			protectText.y = 2732 - 100;
			game.addChild(protectText);
			// Create left arrow
			var leftArrow = new Text2('←', {
				size: 80,
				fill: 0xFFFFFF // White
			});
			leftArrow.anchor.set(0.5, 0.5);
			leftArrow.x = 2048 / 2 - 300;
			leftArrow.y = 2732 - 100;
			game.addChild(leftArrow);
			// Create right arrow
			var rightArrow = new Text2('→', {
				size: 80,
				fill: 0xFFFFFF // White
			});
			rightArrow.anchor.set(0.5, 0.5);
			rightArrow.x = 2048 / 2 + 300;
			rightArrow.y = 2732 - 100;
			game.addChild(rightArrow);
			// Fade out "Go!" after a moment
			LK.setTimeout(function () {
				goText.alpha = 0;
				// Gameplay starts here
				// Always create 2-player ships (force 2 players)
				// P1 ships (red) - left corners
				var p1Ship1 = LK.getAsset('p1Ship', {
					anchorX: 0.5,
					anchorY: 0.5,
					x: 100,
					y: 100,
					scaleX: 1,
					scaleY: 1
				});
				game.addChild(p1Ship1);
				gameplayShips.push(p1Ship1);
				var p1Ship2 = LK.getAsset('p1Ship', {
					anchorX: 0.5,
					anchorY: 0.5,
					x: 100,
					y: 2732 - 100,
					scaleX: 1,
					scaleY: 1
				});
				game.addChild(p1Ship2);
				gameplayShips.push(p1Ship2);
				// P2 ships (blue) - right corners
				var p2Ship1 = LK.getAsset('p2Ship', {
					anchorX: 0.5,
					anchorY: 0.5,
					x: 2048 - 100,
					y: 100,
					scaleX: 1,
					scaleY: 1
				});
				game.addChild(p2Ship1);
				gameplayShips.push(p2Ship1);
				var p2Ship2 = LK.getAsset('p2Ship', {
					anchorX: 0.5,
					anchorY: 0.5,
					x: 2048 - 100,
					y: 2732 - 100,
					scaleX: 1,
					scaleY: 1
				});
				game.addChild(p2Ship2);
				gameplayShips.push(p2Ship2);
				// Create target in center
				target = LK.getAsset('target', {
					anchorX: 0.5,
					anchorY: 0.5,
					x: 2048 / 2,
					y: 2732 / 2,
					scaleX: 1,
					scaleY: 1
				});
				game.addChild(target);
				// Create a second target for P2, positioned near the right side
				target2 = LK.getAsset('target', {
					anchorX: 0.5,
					anchorY: 0.5,
					x: 2048 - 300,
					y: 2732 / 2,
					scaleX: 1,
					scaleY: 1
				});
				game.addChild(target2);
				// Always use 2-player: 4 cannons
				var cannonPositions = [{
					x: 100,
					y: 2732 - 100
				}, {
					x: 200,
					y: 2732 - 100
				}, {
					x: 2048 - 200,
					y: 2732 - 100
				}, {
					x: 2048 - 100,
					y: 2732 - 100
				}];
				for (var i = 0; i < cannonPositions.length; i++) {
					var cannon = LK.getAsset('character', {
						anchorX: 0.5,
						anchorY: 0.5,
						x: cannonPositions[i].x,
						y: cannonPositions[i].y,
						scaleX: 0.5,
						scaleY: 0.5,
						tint: 0x808080 // Gray color for cannons
					});
					game.addChild(cannon);
					cannons.push(cannon);
				}
				// Create lines from cannons to target (initially hidden)
				for (var i = 0; i < cannons.length; i++) {
					var line = LK.getAsset('character', {
						anchorX: 0,
						anchorY: 0.5,
						x: cannons[i].x,
						y: cannons[i].y,
						scaleX: 1,
						scaleY: 0.02,
						// Very thin to simulate a line
						tint: 0xFF0000,
						// Red laser color
						alpha: 0 // Initially hidden
					});
					game.addChild(line);
					cannonLines.push(line);
				}
				// Show score displays at the start of gameplay
				showScoreDisplays();
				updateScoreDisplays();
				// --- INVADER WAVE SETUP ---
				var invaders = [];
				var invaderRows = 3;
				var invaderCols = 8;
				var invaderSpacingX = 180;
				var invaderSpacingY = 120;
				var invaderStartX = 2048 / 2 - (invaderCols - 1) * invaderSpacingX / 2;
				var invaderStartY = 300;
				for (var row = 0; row < invaderRows; row++) {
					for (var col = 0; col < invaderCols; col++) {
						var invader = new Invader();
						invader.x = invaderStartX + col * invaderSpacingX;
						invader.y = invaderStartY + row * invaderSpacingY;
						invader.lastX = invader.x;
						invader.lastY = invader.y;
						game.addChild(invader);
						invaders.push(invader);
					}
				}
				// Add invader update logic to game.update
				function invaderUpdateHandler() {
					// Keep score displays visible and updated
					if (typeof showScoreDisplays === "function" && (!p1ScoreDisplay || !p2ScoreDisplay || !highScoreDisplay)) {
						showScoreDisplays();
					}
					updateScoreDisplays();
					// Keep score displays visible and updated
					if (typeof showScoreDisplays === "function" && (!p1ScoreDisplay || !p2ScoreDisplay || !highScoreDisplay)) {
						showScoreDisplays();
					}
					updateScoreDisplays();
					// Move invaders and check for collisions
					for (var i = invaders.length - 1; i >= 0; i--) {
						var invader = invaders[i];
						invader.update();
						// Check collision with target1 ONLY if P1 lines are visible (shooting)
						if (target && invader.intersects(target) && cannonLines.length >= 2 && (cannonLines[0].alpha > 0 || cannonLines[1].alpha > 0)) {
							invader.destroy();
							invaders.splice(i, 1);
							// Add 50 points to P1 score only
							p1Score += 50;
							if (p1Score + p2Score > highScore) highScore = p1Score + p2Score;
							if (p1Score + p2Score > highScore) highScore = p1Score + p2Score;
							LK.setScore(p1Score + p2Score); // Update total score for compatibility
							updateScoreDisplays();
							updateScoreDisplays();
							continue;
						}
						// Check collision with target2 ONLY if P2 lines are visible (shooting)
						if (typeof target2 !== "undefined" && target2 && invader.intersects(target2) && cannonLines.length >= 4 && (cannonLines[2].alpha > 0 || cannonLines[3].alpha > 0)) {
							invader.destroy();
							invaders.splice(i, 1);
							// Add 50 points to P2 score only
							p2Score += 50;
							if (p1Score + p2Score > highScore) highScore = p1Score + p2Score;
							if (p1Score + p2Score > highScore) highScore = p1Score + p2Score;
							LK.setScore(p1Score + p2Score); // Update total score for compatibility
							updateScoreDisplays();
							updateScoreDisplays();
							continue;
						}
						// Game over if invader reaches bottom
						if (invader.lastY <= 2732 - 60 && invader.y > 2732 - 60) {
							LK.showGameOver();
							return;
						}
					}
					// Check if all invaders from the current level are killed
					if (invaders.length > 0) {
						var allKilled = true;
						for (var i = 0; i < invaders.length; i++) {
							// Only count invaders that are visible and not destroyed
							if (!invaders[i].destroyed && invaders[i].alpha !== 0) {
								allKilled = false;
								break;
							}
						}
						if (allKilled) {
							// Remove all old invaders before starting new level
							for (var i = invaders.length - 1; i >= 0; i--) {
								if (invaders[i] && typeof invaders[i].destroy === "function") {
									invaders[i].destroy();
								}
								invaders.splice(i, 1);
							}
							// Add new invaders for the new level
							var invaderRows = 3;
							var invaderCols = 8;
							var invaderSpacingX = 180;
							var invaderSpacingY = 120;
							var invaderStartX = 2048 / 2 - (invaderCols - 1) * invaderSpacingX / 2;
							var invaderStartY = 300;
							for (var row = 0; row < invaderRows; row++) {
								for (var col = 0; col < invaderCols; col++) {
									var invader = new Invader();
									invader.x = invaderStartX + col * invaderSpacingX;
									invader.y = invaderStartY + row * invaderSpacingY;
									invader.lastX = invader.x;
									invader.lastY = invader.y;
									// Ensure invader is killable and active for this level
									invader.alpha = 1;
									invader.visible = true;
									invader.destroyed = false;
									game.addChild(invader);
									invaders.push(invader);
								}
							}
							// No stage complete popup, just continue to next level
							return;
						}
					}
				}
				// Always call invaderUpdateHandler every frame
				game.update = invaderUpdateHandler;
			}, 1000);
		}, 1000);
	}, 2000);
}

===================================================================
--- original.js
+++ change.js
@@ -743,19 +743,14 @@
 									game.addChild(invader);
 									invaders.push(invader);
 								}
 							}
-							// Restore game.update for new level
-							game.update = invaderUpdateHandler;
-							// Show score displays at top
-							showScoreDisplays();
-							// Update P2 score and high score display
-							updateScoreDisplays();
 							// No stage complete popup, just continue to next level
 							return;
 						}
 					}
 				}
+				// Always call invaderUpdateHandler every frame
 				game.update = invaderUpdateHandler;
 			}, 1000);
 		}, 1000);
 	}, 2000);