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

/**** 
* Classes
****/ 
var Drone = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('drone', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 1.5;
	self.direction = 1;
	self.fireTimer = 0;
	self.fireRate = 45;
	self.update = function () {
		var speedMultiplier = currentSSR ? currentSSR.enemySpeedMultiplier : 1.0;
		self.x += self.speed * self.direction * speedMultiplier;
		self.y += self.speed * 0.5 * speedMultiplier;
		if (self.x <= 50 || self.x >= 1998) {
			self.direction *= -1;
		}
		self.fireTimer++;
		if (self.fireTimer >= self.fireRate) {
			self.fireTimer = 0;
			var bullet = new EnemyBullet();
			bullet.x = self.x;
			bullet.y = self.y;
			bullet.targetX = viggen.x;
			bullet.targetY = viggen.y;
			bullet.age = 0;
			game.addChild(bullet);
			enemyBullets.push(bullet);
		}
		graphics.rotation += 0.05;
	};
	return self;
});
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('enemyBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 4;
	self.targetX = 0;
	self.targetY = 0;
	self.update = function () {
		self.age = (self.age || 0) + 1;
		var dx = self.targetX - self.x;
		var dy = self.targetY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > 0) {
			var speedMultiplier = currentSSR ? currentSSR.enemySpeedMultiplier : 1.0;
			self.x += dx / distance * self.speed * speedMultiplier;
			self.y += dy / distance * self.speed * speedMultiplier;
		}
	};
	return self;
});
var Interceptor = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('interceptor', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2;
	self.fireTimer = 0;
	self.fireRate = 60;
	self.update = function () {
		var speedMultiplier = currentSSR ? currentSSR.enemySpeedMultiplier : 1.0;
		self.y += self.speed * speedMultiplier;
		self.fireTimer++;
		if (self.fireTimer >= self.fireRate) {
			self.fireTimer = 0;
			var bullet = new EnemyBullet();
			bullet.x = self.x;
			bullet.y = self.y;
			bullet.targetX = viggen.x;
			bullet.targetY = viggen.y;
			bullet.age = 0;
			game.addChild(bullet);
			enemyBullets.push(bullet);
		}
	};
	return self;
});
var Powerup = Container.expand(function () {
	var self = Container.call(this);
	self.powerupType = 'speed'; // 'speed', 'shield', 'rapidfire'
	self.speed = 2;
	self.bobOffset = 0;
	self.bobSpeed = 0.1;
	self.setPowerupType = function (type) {
		self.powerupType = type;
		if (self.graphics) {
			self.removeChild(self.graphics);
		}
		var assetName = 'powerupSpeed';
		if (type === 'shield') {
			assetName = 'powerupShield';
		} else if (type === 'rapidfire') {
			assetName = 'powerupRapidFire';
		}
		self.graphics = self.attachAsset(assetName, {
			anchorX: 0.5,
			anchorY: 0.5
		});
	};
	self.update = function () {
		self.y += self.speed;
		self.bobOffset += self.bobSpeed;
		self.graphics.y = Math.sin(self.bobOffset) * 10;
		self.graphics.rotation += 0.05;
	};
	return self;
});
var SAMMissile = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('samMissile', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 6;
	self.targetX = 0;
	self.targetY = 0;
	self.update = function () {
		var dx = self.targetX - self.x;
		var dy = self.targetY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > 0) {
			self.x += dx / distance * self.speed;
			self.y += dy / distance * self.speed;
		}
		graphics.rotation += 0.1;
	};
	return self;
});
var SAMSite = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('sam', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.fireTimer = 0;
	self.fireRate = 90;
	self.update = function () {
		self.fireTimer++;
		if (self.fireTimer >= self.fireRate) {
			self.fireTimer = 0;
			var missile = new SAMMissile();
			missile.x = self.x;
			missile.y = self.y;
			missile.targetX = viggen.x;
			missile.targetY = viggen.y;
			game.addChild(missile);
			samMissiles.push(missile);
			LK.getSound('missile').play();
		}
	};
	return self;
});
var SSR = Container.expand(function () {
	var self = Container.call(this);
	self.name = '';
	self.difficultyMultiplier = 1.0;
	self.enemySpeedMultiplier = 1.0;
	self.spawnRateMultiplier = 1.0;
	self.scoreMultiplier = 1.0;
	self.backgroundColor = 0x1a1a2e;
	self.description = '';
	self.setSSRData = function (data) {
		self.name = data.name;
		self.difficultyMultiplier = data.difficultyMultiplier;
		self.enemySpeedMultiplier = data.enemySpeedMultiplier;
		self.spawnRateMultiplier = data.spawnRateMultiplier;
		self.scoreMultiplier = data.scoreMultiplier;
		self.backgroundColor = data.backgroundColor;
		self.description = data.description;
		if (self.graphics) {
			self.removeChild(self.graphics);
		}
		self.graphics = self.attachAsset(data.assetName, {
			anchorX: 0.5,
			anchorY: 0.5
		});
	};
	return self;
});
var Viggen = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('viggen', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	return self;
});
var ViggenBullet = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('viggenBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 8 + (upgrades.bulletSpeed - 1) * 2;
	self.damage = upgrades.bulletDamage;
	self.update = function () {
		self.y -= self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x1a1a2e
});

/**** 
* Game Code
****/ 
var viggen = game.addChild(new Viggen());
viggen.x = 1024;
viggen.y = 2400;
var shieldEffect = null;
// Upgrade system variables
var upgradeMenuOpen = false;
var upgradeButton = null;
var upgradeMenu = null;
var upgrades = {
	fireRate: storage.fireRateLevel || 1,
	bulletSpeed: storage.bulletSpeedLevel || 1,
	bulletDamage: storage.bulletDamageLevel || 1,
	shieldDuration: storage.shieldDurationLevel || 1
};
var upgradeCosts = {
	fireRate: [100, 250, 500, 1000, 2000],
	bulletSpeed: [150, 300, 600, 1200, 2400],
	bulletDamage: [200, 400, 800, 1600, 3200],
	shieldDuration: [300, 600, 1200, 2400, 4800]
};
var upgradeTexts = [];
// SSR Travel System
var currentSSR = null;
var ssrMenuOpen = false;
var ssrButton = null;
var ssrMenu = null;
var ssrUnlocked = {
	ukraine: true,
	russia: storage.russiaUnlocked || false,
	kazakh: storage.kazakhUnlocked || false,
	belarus: storage.belarusUnlocked || false
};
var ssrData = {
	ukraine: {
		name: 'Ukrainian SSR',
		assetName: 'ssrUkraine',
		difficultyMultiplier: 1.0,
		enemySpeedMultiplier: 1.0,
		spawnRateMultiplier: 1.0,
		scoreMultiplier: 1.0,
		backgroundColor: 0x1a1a2e,
		description: 'Starting region with standard difficulty',
		unlockScore: 0
	},
	russia: {
		name: 'Russian SFSR',
		assetName: 'ssrRussia',
		difficultyMultiplier: 1.3,
		enemySpeedMultiplier: 1.2,
		spawnRateMultiplier: 1.1,
		scoreMultiplier: 1.5,
		backgroundColor: 0x2e1a1a,
		description: 'Harsh winter conditions, faster enemies',
		unlockScore: 2000
	},
	kazakh: {
		name: 'Kazakh SSR',
		assetName: 'ssrKazakh',
		difficultyMultiplier: 1.5,
		enemySpeedMultiplier: 1.1,
		spawnRateMultiplier: 1.3,
		scoreMultiplier: 2.0,
		backgroundColor: 0x2e2e1a,
		description: 'Desert warfare, more frequent spawns',
		unlockScore: 5000
	},
	belarus: {
		name: 'Byelorussian SSR',
		assetName: 'ssrBelarus',
		difficultyMultiplier: 1.8,
		enemySpeedMultiplier: 1.4,
		spawnRateMultiplier: 1.2,
		scoreMultiplier: 2.5,
		backgroundColor: 0x1a2e1a,
		description: 'Forest combat, elite enemy units',
		unlockScore: 10000
	}
};
var interceptors = [];
var samSites = [];
var drones = [];
var enemyBullets = [];
var samMissiles = [];
var viggenBullets = [];
var powerups = [];
var spawnTimer = 0;
var powerupSpawnTimer = 0;
var fireTimer = 0;
var difficultyTimer = 0;
var survivalTime = 0;
var baseSpawnRate = 180;
var currentSpawnRate = baseSpawnRate;
var dragNode = null;
var lastIntersecting = false;
var speedBoostActive = false;
var speedBoostTimer = 0;
var shieldActive = false;
var shieldTimer = 0;
var rapidFireActive = false;
var rapidFireTimer = 0;
var normalFireRate = 15;
var scoreTxt = new Text2('Score: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var timeTxt = new Text2('Time: 0s', {
	size: 50,
	fill: 0xFFFFFF
});
timeTxt.anchor.set(1, 0);
timeTxt.x = -20;
timeTxt.y = 20;
LK.gui.topRight.addChild(timeTxt);
upgradeButton = new Text2('UPGRADES', {
	size: 40,
	fill: 0x00ff00
});
upgradeButton.anchor.set(0.5, 0);
upgradeButton.x = 0;
upgradeButton.y = 100;
upgradeButton.interactive = true;
LK.gui.top.addChild(upgradeButton);
ssrButton = new Text2('TRAVEL', {
	size: 40,
	fill: 0x0088ff
});
ssrButton.anchor.set(0.5, 0);
ssrButton.x = 0;
ssrButton.y = 160;
ssrButton.interactive = true;
LK.gui.top.addChild(ssrButton);
// Initialize with Ukrainian SSR
currentSSR = new SSR();
currentSSR.setSSRData(ssrData.ukraine);
game.setBackgroundColor(currentSSR.backgroundColor);
function handleMove(x, y, obj) {
	if (dragNode) {
		var moveSpeed = speedBoostActive ? 1.5 : 1.0;
		var targetX = x;
		var targetY = y;
		if (speedBoostActive) {
			// Smoother movement with speed boost
			var dx = targetX - dragNode.x;
			var dy = targetY - dragNode.y;
			dragNode.x = Math.max(40, Math.min(2008, dragNode.x + dx * moveSpeed));
			dragNode.y = Math.max(60, Math.min(2672, dragNode.y + dy * moveSpeed));
		} else {
			dragNode.x = Math.max(40, Math.min(2008, targetX));
			dragNode.y = Math.max(60, Math.min(2672, targetY));
		}
	}
	// Check viggen bullets vs enemies
	for (var i = viggenBullets.length - 1; i >= 0; i--) {
		var bullet = viggenBullets[i];
		var hit = false;
		// Check vs interceptors
		for (var j = interceptors.length - 1; j >= 0; j--) {
			if (bullet.intersects(interceptors[j])) {
				LK.effects.flashObject(interceptors[j], 0xff0000, 200);
				interceptors[j].destroy();
				interceptors.splice(j, 1);
				bullet.destroy();
				viggenBullets.splice(i, 1);
				var baseScore = 100 * bullet.damage;
				var ssrMultiplier = currentSSR ? currentSSR.scoreMultiplier : 1.0;
				LK.setScore(LK.getScore() + Math.floor(baseScore * ssrMultiplier));
				hit = true;
				break;
			}
		}
		if (hit) continue;
		// Check vs drones
		for (var j = drones.length - 1; j >= 0; j--) {
			if (bullet.intersects(drones[j])) {
				LK.effects.flashObject(drones[j], 0xff0000, 200);
				drones[j].destroy();
				drones.splice(j, 1);
				bullet.destroy();
				viggenBullets.splice(i, 1);
				var baseScore = 150 * bullet.damage;
				var ssrMultiplier = currentSSR ? currentSSR.scoreMultiplier : 1.0;
				LK.setScore(LK.getScore() + Math.floor(baseScore * ssrMultiplier));
				hit = true;
				break;
			}
		}
		if (hit) continue;
		// Check vs SAM sites
		for (var j = samSites.length - 1; j >= 0; j--) {
			if (bullet.intersects(samSites[j])) {
				LK.effects.flashObject(samSites[j], 0xff0000, 200);
				samSites[j].destroy();
				samSites.splice(j, 1);
				bullet.destroy();
				viggenBullets.splice(i, 1);
				var baseScore = 200 * bullet.damage;
				var ssrMultiplier = currentSSR ? currentSSR.scoreMultiplier : 1.0;
				LK.setScore(LK.getScore() + Math.floor(baseScore * ssrMultiplier));
				hit = true;
				break;
			}
		}
	}
	// Check viggen vs powerups
	for (var i = powerups.length - 1; i >= 0; i--) {
		var powerup = powerups[i];
		if (viggen.intersects(powerup)) {
			// Apply powerup effect
			if (powerup.powerupType === 'speed') {
				speedBoostActive = true;
				speedBoostTimer = 300; // 5 seconds at 60fps
				LK.effects.flashObject(viggen, 0x00ff00, 300);
			} else if (powerup.powerupType === 'shield') {
				shieldActive = true;
				shieldTimer = 600 + (upgrades.shieldDuration - 1) * 180; // Base 10s + upgrades
				if (!shieldEffect) {
					shieldEffect = LK.getAsset('powerupShield', {
						anchorX: 0.5,
						anchorY: 0.5,
						scaleX: 2.5,
						scaleY: 2.5
					});
					shieldEffect.alpha = 0.3;
					viggen.addChild(shieldEffect);
				}
			} else if (powerup.powerupType === 'rapidfire') {
				rapidFireActive = true;
				rapidFireTimer = 450; // 7.5 seconds at 60fps
				LK.effects.flashObject(viggen, 0xff8800, 300);
			}
			LK.getSound('powerup').play();
			LK.setScore(LK.getScore() + 50);
			powerup.destroy();
			powerups.splice(i, 1);
		}
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	dragNode = viggen;
	handleMove(x, y, obj);
};
game.up = function (x, y, obj) {
	dragNode = null;
};
upgradeButton.down = function (x, y, obj) {
	if (!upgradeMenuOpen) {
		openUpgradeMenu();
	} else {
		closeUpgradeMenu();
	}
};
ssrButton.down = function (x, y, obj) {
	if (!ssrMenuOpen) {
		openSSRMenu();
	} else {
		closeSSRMenu();
	}
};
function spawnInterceptor() {
	var interceptor = new Interceptor();
	interceptor.x = Math.random() * 1848 + 100;
	interceptor.y = -100;
	game.addChild(interceptor);
	interceptors.push(interceptor);
}
function spawnSAMSite() {
	var sam = new SAMSite();
	sam.x = Math.random() * 1848 + 100;
	sam.y = Math.random() * 400 + 100;
	game.addChild(sam);
	samSites.push(sam);
}
function spawnDrone() {
	var drone = new Drone();
	drone.x = Math.random() * 1848 + 100;
	drone.y = -50;
	game.addChild(drone);
	drones.push(drone);
}
function spawnPowerup() {
	var powerup = new Powerup();
	powerup.x = Math.random() * 1600 + 224;
	powerup.y = -50;
	var powerupTypes = ['speed', 'shield', 'rapidfire'];
	var randomType = powerupTypes[Math.floor(Math.random() * powerupTypes.length)];
	powerup.setPowerupType(randomType);
	game.addChild(powerup);
	powerups.push(powerup);
}
function openUpgradeMenu() {
	upgradeMenuOpen = true;
	upgradeButton.setText('CLOSE');
	upgradeMenu = new Container();
	upgradeMenu.x = 0;
	upgradeMenu.y = 0;
	game.addChild(upgradeMenu);
	var menuBg = LK.getAsset('sam', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 15,
		scaleY: 20
	});
	menuBg.x = 1024;
	menuBg.y = 1366;
	menuBg.alpha = 0.9;
	menuBg.tint = 0x000066;
	upgradeMenu.addChild(menuBg);
	var titleText = new Text2('UPGRADES', {
		size: 80,
		fill: 0xFFFFFF
	});
	titleText.anchor.set(0.5, 0.5);
	titleText.x = 1024;
	titleText.y = 1000;
	upgradeMenu.addChild(titleText);
	var currentScore = LK.getScore();
	var scoreText = new Text2('Score: ' + currentScore, {
		size: 50,
		fill: 0xFFFF00
	});
	scoreText.anchor.set(0.5, 0.5);
	scoreText.x = 1024;
	scoreText.y = 1100;
	upgradeMenu.addChild(scoreText);
	createUpgradeOption('Fire Rate', 'fireRate', 1200);
	createUpgradeOption('Bullet Speed', 'bulletSpeed', 1300);
	createUpgradeOption('Bullet Damage', 'bulletDamage', 1400);
	createUpgradeOption('Shield Duration', 'shieldDuration', 1500);
}
function createUpgradeOption(name, upgradeType, yPos) {
	var level = upgrades[upgradeType];
	var maxLevel = upgradeCosts[upgradeType].length;
	var cost = level < maxLevel ? upgradeCosts[upgradeType][level - 1] : 'MAX';
	var upgradeText = new Text2(name + ' Lv.' + level + ' - Cost: ' + cost, {
		size: 40,
		fill: level < maxLevel && LK.getScore() >= cost ? 0x00ff00 : 0xff6666
	});
	upgradeText.anchor.set(0.5, 0.5);
	upgradeText.x = 1024;
	upgradeText.y = yPos;
	upgradeText.interactive = true;
	upgradeMenu.addChild(upgradeText);
	upgradeTexts.push({
		text: upgradeText,
		type: upgradeType
	});
	if (level < maxLevel && LK.getScore() >= cost) {
		upgradeText.down = function () {
			buyUpgrade(upgradeType);
		};
	}
}
function buyUpgrade(upgradeType) {
	var level = upgrades[upgradeType];
	var maxLevel = upgradeCosts[upgradeType].length;
	var cost = upgradeCosts[upgradeType][level - 1];
	if (level < maxLevel && LK.getScore() >= cost) {
		LK.setScore(LK.getScore() - cost);
		upgrades[upgradeType]++;
		// Save to storage
		if (upgradeType === 'fireRate') storage.fireRateLevel = upgrades[upgradeType];else if (upgradeType === 'bulletSpeed') storage.bulletSpeedLevel = upgrades[upgradeType];else if (upgradeType === 'bulletDamage') storage.bulletDamageLevel = upgrades[upgradeType];else if (upgradeType === 'shieldDuration') storage.shieldDurationLevel = upgrades[upgradeType];
		scoreTxt.setText('Score: ' + LK.getScore());
		LK.getSound('powerup').play();
		closeUpgradeMenu();
	}
}
function closeUpgradeMenu() {
	upgradeMenuOpen = false;
	upgradeButton.setText('UPGRADES');
	if (upgradeMenu) {
		game.removeChild(upgradeMenu);
		upgradeMenu = null;
		upgradeTexts = [];
	}
}
function openSSRMenu() {
	ssrMenuOpen = true;
	ssrButton.setText('CLOSE');
	ssrMenu = new Container();
	ssrMenu.x = 0;
	ssrMenu.y = 0;
	game.addChild(ssrMenu);
	var menuBg = LK.getAsset('sam', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 15,
		scaleY: 20
	});
	menuBg.x = 1024;
	menuBg.y = 1366;
	menuBg.alpha = 0.9;
	menuBg.tint = 0x006666;
	ssrMenu.addChild(menuBg);
	var titleText = new Text2('SOVIET SOCIALIST REPUBLICS', {
		size: 60,
		fill: 0xFFFFFF
	});
	titleText.anchor.set(0.5, 0.5);
	titleText.x = 1024;
	titleText.y = 900;
	ssrMenu.addChild(titleText);
	var currentText = new Text2('Current: ' + currentSSR.name, {
		size: 40,
		fill: 0xFFFF00
	});
	currentText.anchor.set(0.5, 0.5);
	currentText.x = 1024;
	currentText.y = 980;
	ssrMenu.addChild(currentText);
	var yPos = 1100;
	for (var ssrKey in ssrData) {
		createSSROption(ssrKey, ssrData[ssrKey], yPos);
		yPos += 100;
	}
	// Check for unlocks
	checkSSRUnlocks();
}
function createSSROption(ssrKey, data, yPos) {
	var isUnlocked = ssrUnlocked[ssrKey];
	var isCurrent = currentSSR.name === data.name;
	var statusText = isCurrent ? ' (CURRENT)' : isUnlocked ? ' - AVAILABLE' : ' - LOCKED (Score: ' + data.unlockScore + ')';
	var optionText = new Text2(data.name + statusText, {
		size: 35,
		fill: isCurrent ? 0xFFFF00 : isUnlocked ? 0x00ff00 : 0xff6666
	});
	optionText.anchor.set(0.5, 0.5);
	optionText.x = 1024;
	optionText.y = yPos;
	optionText.interactive = true;
	ssrMenu.addChild(optionText);
	var descText = new Text2(data.description, {
		size: 25,
		fill: 0xCCCCCC
	});
	descText.anchor.set(0.5, 0.5);
	descText.x = 1024;
	descText.y = yPos + 30;
	ssrMenu.addChild(descText);
	if (isUnlocked && !isCurrent) {
		optionText.down = function () {
			travelToSSR(ssrKey);
		};
	}
}
function travelToSSR(ssrKey) {
	var data = ssrData[ssrKey];
	currentSSR.setSSRData(data);
	game.setBackgroundColor(currentSSR.backgroundColor);
	LK.getSound('travel').play();
	LK.effects.flashScreen(0x00ffff, 500);
	// Reset some game state for new region
	spawnTimer = 0;
	currentSpawnRate = Math.floor(baseSpawnRate / currentSSR.spawnRateMultiplier);
	closeSSRMenu();
}
function closeSSRMenu() {
	ssrMenuOpen = false;
	ssrButton.setText('TRAVEL');
	if (ssrMenu) {
		game.removeChild(ssrMenu);
		ssrMenu = null;
	}
}
function checkSSRUnlocks() {
	var currentScore = LK.getScore();
	for (var ssrKey in ssrData) {
		if (!ssrUnlocked[ssrKey] && currentScore >= ssrData[ssrKey].unlockScore) {
			ssrUnlocked[ssrKey] = true;
			// Save unlock status
			if (ssrKey === 'russia') storage.russiaUnlocked = true;else if (ssrKey === 'kazakh') storage.kazakhUnlocked = true;else if (ssrKey === 'belarus') storage.belarusUnlocked = true;
			LK.effects.flashScreen(0x00ff00, 300);
		}
	}
}
function checkCollisions() {
	if (shieldActive) {
		// Shield protects from all damage
		return;
	}
	for (var i = 0; i < enemyBullets.length; i++) {
		if (viggen.intersects(enemyBullets[i])) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.getSound('explosion').play();
			LK.showGameOver();
			return;
		}
	}
	for (var i = 0; i < samMissiles.length; i++) {
		if (viggen.intersects(samMissiles[i])) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.getSound('explosion').play();
			LK.showGameOver();
			return;
		}
	}
	for (var i = 0; i < interceptors.length; i++) {
		if (viggen.intersects(interceptors[i])) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.getSound('explosion').play();
			LK.showGameOver();
			return;
		}
	}
	for (var i = 0; i < drones.length; i++) {
		if (viggen.intersects(drones[i])) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.getSound('explosion').play();
			LK.showGameOver();
			return;
		}
	}
}
function cleanupOffscreenEntities() {
	for (var i = interceptors.length - 1; i >= 0; i--) {
		if (interceptors[i].y > 2800) {
			interceptors[i].destroy();
			interceptors.splice(i, 1);
		}
	}
	for (var i = drones.length - 1; i >= 0; i--) {
		if (drones[i].y > 2800) {
			drones[i].destroy();
			drones.splice(i, 1);
		}
	}
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		var bullet = enemyBullets[i];
		if (bullet.x < -20 || bullet.x > 2068 || bullet.y < -20 || bullet.y > 2752 || bullet.age && bullet.age > 300) {
			bullet.destroy();
			enemyBullets.splice(i, 1);
		}
	}
	for (var i = samMissiles.length - 1; i >= 0; i--) {
		var missile = samMissiles[i];
		if (missile.x < -50 || missile.x > 2098 || missile.y < -50 || missile.y > 2782) {
			missile.destroy();
			samMissiles.splice(i, 1);
		}
	}
	for (var i = samSites.length - 1; i >= 0; i--) {
		if (samSites[i].y > 2800 || samSites[i].x < -100 || samSites[i].x > 2148) {
			samSites[i].destroy();
			samSites.splice(i, 1);
		}
	}
	// Clean up viggen bullets
	for (var i = viggenBullets.length - 1; i >= 0; i--) {
		if (viggenBullets[i].y < -50) {
			viggenBullets[i].destroy();
			viggenBullets.splice(i, 1);
		}
	}
	// Clean up powerups
	for (var i = powerups.length - 1; i >= 0; i--) {
		if (powerups[i].y > 2800) {
			powerups[i].destroy();
			powerups.splice(i, 1);
		}
	}
}
game.update = function () {
	survivalTime++;
	difficultyTimer++;
	spawnTimer++;
	if (LK.ticks % 60 === 0) {
		var timeInSeconds = Math.floor(survivalTime / 60);
		timeTxt.setText('Time: ' + timeInSeconds + 's');
		var score = timeInSeconds * 10 + Math.floor(survivalTime / 6);
		LK.setScore(score);
		scoreTxt.setText('Score: ' + score);
	}
	if (difficultyTimer >= 300) {
		difficultyTimer = 0;
		currentSpawnRate = Math.max(60, currentSpawnRate - 10);
	}
	// Apply SSR spawn rate multiplier
	var ssrSpawnRate = currentSSR ? Math.floor(currentSpawnRate / currentSSR.spawnRateMultiplier) : currentSpawnRate;
	if (spawnTimer >= ssrSpawnRate) {
		spawnTimer = 0;
		var spawnType = Math.random();
		if (spawnType < 0.4) {
			spawnInterceptor();
		} else if (spawnType < 0.9) {
			spawnDrone();
		} else {
			spawnSAMSite();
		}
	}
	// Check for SSR unlocks
	checkSSRUnlocks();
	// Spawn powerups occasionally
	powerupSpawnTimer++;
	if (powerupSpawnTimer >= 900) {
		// Every 15 seconds
		powerupSpawnTimer = 0;
		spawnPowerup();
	}
	// Update powerup effects
	if (speedBoostTimer > 0) {
		speedBoostTimer--;
		if (speedBoostTimer === 0) {
			speedBoostActive = false;
		}
	}
	if (shieldTimer > 0) {
		shieldTimer--;
		if (shieldTimer === 0) {
			shieldActive = false;
			if (shieldEffect) {
				viggen.removeChild(shieldEffect);
				shieldEffect = null;
			}
		}
	}
	if (rapidFireTimer > 0) {
		rapidFireTimer--;
		if (rapidFireTimer === 0) {
			rapidFireActive = false;
		}
	}
	// Fire viggen bullets
	fireTimer++;
	var upgradeFireRate = Math.max(5, normalFireRate - (upgrades.fireRate - 1) * 2);
	var currentFireRate = rapidFireActive ? Math.floor(upgradeFireRate / 3) : upgradeFireRate;
	if (fireTimer >= currentFireRate) {
		fireTimer = 0;
		var bullet = new ViggenBullet();
		bullet.x = viggen.x;
		bullet.y = viggen.y - 60;
		game.addChild(bullet);
		viggenBullets.push(bullet);
		LK.getSound('shoot').play();
	}
	checkCollisions();
	cleanupOffscreenEntities();
	if (enemyBullets.length > 200) {
		for (var i = 0; i < 50; i++) {
			if (enemyBullets[i]) {
				enemyBullets[i].destroy();
				enemyBullets.splice(i, 1);
			}
		}
	}
	if (samMissiles.length > 100) {
		for (var i = 0; i < 25; i++) {
			if (samMissiles[i]) {
				samMissiles[i].destroy();
				samMissiles.splice(i, 1);
			}
		}
	}
};
LK.playMusic('combat');

===================================================================
--- original.js
+++ change.js
@@ -17,10 +17,11 @@
 	self.direction = 1;
 	self.fireTimer = 0;
 	self.fireRate = 45;
 	self.update = function () {
-		self.x += self.speed * self.direction;
-		self.y += self.speed * 0.5;
+		var speedMultiplier = currentSSR ? currentSSR.enemySpeedMultiplier : 1.0;
+		self.x += self.speed * self.direction * speedMultiplier;
+		self.y += self.speed * 0.5 * speedMultiplier;
 		if (self.x <= 50 || self.x >= 1998) {
 			self.direction *= -1;
 		}
 		self.fireTimer++;
@@ -53,10 +54,11 @@
 		var dx = self.targetX - self.x;
 		var dy = self.targetY - self.y;
 		var distance = Math.sqrt(dx * dx + dy * dy);
 		if (distance > 0) {
-			self.x += dx / distance * self.speed;
-			self.y += dy / distance * self.speed;
+			var speedMultiplier = currentSSR ? currentSSR.enemySpeedMultiplier : 1.0;
+			self.x += dx / distance * self.speed * speedMultiplier;
+			self.y += dy / distance * self.speed * speedMultiplier;
 		}
 	};
 	return self;
 });
@@ -69,9 +71,10 @@
 	self.speed = 2;
 	self.fireTimer = 0;
 	self.fireRate = 60;
 	self.update = function () {
-		self.y += self.speed;
+		var speedMultiplier = currentSSR ? currentSSR.enemySpeedMultiplier : 1.0;
+		self.y += self.speed * speedMultiplier;
 		self.fireTimer++;
 		if (self.fireTimer >= self.fireRate) {
 			self.fireTimer = 0;
 			var bullet = new EnemyBullet();
@@ -160,8 +163,35 @@
 		}
 	};
 	return self;
 });
+var SSR = Container.expand(function () {
+	var self = Container.call(this);
+	self.name = '';
+	self.difficultyMultiplier = 1.0;
+	self.enemySpeedMultiplier = 1.0;
+	self.spawnRateMultiplier = 1.0;
+	self.scoreMultiplier = 1.0;
+	self.backgroundColor = 0x1a1a2e;
+	self.description = '';
+	self.setSSRData = function (data) {
+		self.name = data.name;
+		self.difficultyMultiplier = data.difficultyMultiplier;
+		self.enemySpeedMultiplier = data.enemySpeedMultiplier;
+		self.spawnRateMultiplier = data.spawnRateMultiplier;
+		self.scoreMultiplier = data.scoreMultiplier;
+		self.backgroundColor = data.backgroundColor;
+		self.description = data.description;
+		if (self.graphics) {
+			self.removeChild(self.graphics);
+		}
+		self.graphics = self.attachAsset(data.assetName, {
+			anchorX: 0.5,
+			anchorY: 0.5
+		});
+	};
+	return self;
+});
 var Viggen = Container.expand(function () {
 	var self = Container.call(this);
 	var graphics = self.attachAsset('viggen', {
 		anchorX: 0.5,
@@ -213,8 +243,65 @@
 	bulletDamage: [200, 400, 800, 1600, 3200],
 	shieldDuration: [300, 600, 1200, 2400, 4800]
 };
 var upgradeTexts = [];
+// SSR Travel System
+var currentSSR = null;
+var ssrMenuOpen = false;
+var ssrButton = null;
+var ssrMenu = null;
+var ssrUnlocked = {
+	ukraine: true,
+	russia: storage.russiaUnlocked || false,
+	kazakh: storage.kazakhUnlocked || false,
+	belarus: storage.belarusUnlocked || false
+};
+var ssrData = {
+	ukraine: {
+		name: 'Ukrainian SSR',
+		assetName: 'ssrUkraine',
+		difficultyMultiplier: 1.0,
+		enemySpeedMultiplier: 1.0,
+		spawnRateMultiplier: 1.0,
+		scoreMultiplier: 1.0,
+		backgroundColor: 0x1a1a2e,
+		description: 'Starting region with standard difficulty',
+		unlockScore: 0
+	},
+	russia: {
+		name: 'Russian SFSR',
+		assetName: 'ssrRussia',
+		difficultyMultiplier: 1.3,
+		enemySpeedMultiplier: 1.2,
+		spawnRateMultiplier: 1.1,
+		scoreMultiplier: 1.5,
+		backgroundColor: 0x2e1a1a,
+		description: 'Harsh winter conditions, faster enemies',
+		unlockScore: 2000
+	},
+	kazakh: {
+		name: 'Kazakh SSR',
+		assetName: 'ssrKazakh',
+		difficultyMultiplier: 1.5,
+		enemySpeedMultiplier: 1.1,
+		spawnRateMultiplier: 1.3,
+		scoreMultiplier: 2.0,
+		backgroundColor: 0x2e2e1a,
+		description: 'Desert warfare, more frequent spawns',
+		unlockScore: 5000
+	},
+	belarus: {
+		name: 'Byelorussian SSR',
+		assetName: 'ssrBelarus',
+		difficultyMultiplier: 1.8,
+		enemySpeedMultiplier: 1.4,
+		spawnRateMultiplier: 1.2,
+		scoreMultiplier: 2.5,
+		backgroundColor: 0x1a2e1a,
+		description: 'Forest combat, elite enemy units',
+		unlockScore: 10000
+	}
+};
 var interceptors = [];
 var samSites = [];
 var drones = [];
 var enemyBullets = [];
@@ -259,8 +346,21 @@
 upgradeButton.x = 0;
 upgradeButton.y = 100;
 upgradeButton.interactive = true;
 LK.gui.top.addChild(upgradeButton);
+ssrButton = new Text2('TRAVEL', {
+	size: 40,
+	fill: 0x0088ff
+});
+ssrButton.anchor.set(0.5, 0);
+ssrButton.x = 0;
+ssrButton.y = 160;
+ssrButton.interactive = true;
+LK.gui.top.addChild(ssrButton);
+// Initialize with Ukrainian SSR
+currentSSR = new SSR();
+currentSSR.setSSRData(ssrData.ukraine);
+game.setBackgroundColor(currentSSR.backgroundColor);
 function handleMove(x, y, obj) {
 	if (dragNode) {
 		var moveSpeed = speedBoostActive ? 1.5 : 1.0;
 		var targetX = x;
@@ -287,9 +387,11 @@
 				interceptors[j].destroy();
 				interceptors.splice(j, 1);
 				bullet.destroy();
 				viggenBullets.splice(i, 1);
-				LK.setScore(LK.getScore() + 100 * bullet.damage);
+				var baseScore = 100 * bullet.damage;
+				var ssrMultiplier = currentSSR ? currentSSR.scoreMultiplier : 1.0;
+				LK.setScore(LK.getScore() + Math.floor(baseScore * ssrMultiplier));
 				hit = true;
 				break;
 			}
 		}
@@ -301,9 +403,11 @@
 				drones[j].destroy();
 				drones.splice(j, 1);
 				bullet.destroy();
 				viggenBullets.splice(i, 1);
-				LK.setScore(LK.getScore() + 150 * bullet.damage);
+				var baseScore = 150 * bullet.damage;
+				var ssrMultiplier = currentSSR ? currentSSR.scoreMultiplier : 1.0;
+				LK.setScore(LK.getScore() + Math.floor(baseScore * ssrMultiplier));
 				hit = true;
 				break;
 			}
 		}
@@ -315,9 +419,11 @@
 				samSites[j].destroy();
 				samSites.splice(j, 1);
 				bullet.destroy();
 				viggenBullets.splice(i, 1);
-				LK.setScore(LK.getScore() + 200 * bullet.damage);
+				var baseScore = 200 * bullet.damage;
+				var ssrMultiplier = currentSSR ? currentSSR.scoreMultiplier : 1.0;
+				LK.setScore(LK.getScore() + Math.floor(baseScore * ssrMultiplier));
 				hit = true;
 				break;
 			}
 		}
@@ -370,8 +476,15 @@
 	} else {
 		closeUpgradeMenu();
 	}
 };
+ssrButton.down = function (x, y, obj) {
+	if (!ssrMenuOpen) {
+		openSSRMenu();
+	} else {
+		closeSSRMenu();
+	}
+};
 function spawnInterceptor() {
 	var interceptor = new Interceptor();
 	interceptor.x = Math.random() * 1848 + 100;
 	interceptor.y = -100;
@@ -487,8 +600,107 @@
 		upgradeMenu = null;
 		upgradeTexts = [];
 	}
 }
+function openSSRMenu() {
+	ssrMenuOpen = true;
+	ssrButton.setText('CLOSE');
+	ssrMenu = new Container();
+	ssrMenu.x = 0;
+	ssrMenu.y = 0;
+	game.addChild(ssrMenu);
+	var menuBg = LK.getAsset('sam', {
+		anchorX: 0.5,
+		anchorY: 0.5,
+		scaleX: 15,
+		scaleY: 20
+	});
+	menuBg.x = 1024;
+	menuBg.y = 1366;
+	menuBg.alpha = 0.9;
+	menuBg.tint = 0x006666;
+	ssrMenu.addChild(menuBg);
+	var titleText = new Text2('SOVIET SOCIALIST REPUBLICS', {
+		size: 60,
+		fill: 0xFFFFFF
+	});
+	titleText.anchor.set(0.5, 0.5);
+	titleText.x = 1024;
+	titleText.y = 900;
+	ssrMenu.addChild(titleText);
+	var currentText = new Text2('Current: ' + currentSSR.name, {
+		size: 40,
+		fill: 0xFFFF00
+	});
+	currentText.anchor.set(0.5, 0.5);
+	currentText.x = 1024;
+	currentText.y = 980;
+	ssrMenu.addChild(currentText);
+	var yPos = 1100;
+	for (var ssrKey in ssrData) {
+		createSSROption(ssrKey, ssrData[ssrKey], yPos);
+		yPos += 100;
+	}
+	// Check for unlocks
+	checkSSRUnlocks();
+}
+function createSSROption(ssrKey, data, yPos) {
+	var isUnlocked = ssrUnlocked[ssrKey];
+	var isCurrent = currentSSR.name === data.name;
+	var statusText = isCurrent ? ' (CURRENT)' : isUnlocked ? ' - AVAILABLE' : ' - LOCKED (Score: ' + data.unlockScore + ')';
+	var optionText = new Text2(data.name + statusText, {
+		size: 35,
+		fill: isCurrent ? 0xFFFF00 : isUnlocked ? 0x00ff00 : 0xff6666
+	});
+	optionText.anchor.set(0.5, 0.5);
+	optionText.x = 1024;
+	optionText.y = yPos;
+	optionText.interactive = true;
+	ssrMenu.addChild(optionText);
+	var descText = new Text2(data.description, {
+		size: 25,
+		fill: 0xCCCCCC
+	});
+	descText.anchor.set(0.5, 0.5);
+	descText.x = 1024;
+	descText.y = yPos + 30;
+	ssrMenu.addChild(descText);
+	if (isUnlocked && !isCurrent) {
+		optionText.down = function () {
+			travelToSSR(ssrKey);
+		};
+	}
+}
+function travelToSSR(ssrKey) {
+	var data = ssrData[ssrKey];
+	currentSSR.setSSRData(data);
+	game.setBackgroundColor(currentSSR.backgroundColor);
+	LK.getSound('travel').play();
+	LK.effects.flashScreen(0x00ffff, 500);
+	// Reset some game state for new region
+	spawnTimer = 0;
+	currentSpawnRate = Math.floor(baseSpawnRate / currentSSR.spawnRateMultiplier);
+	closeSSRMenu();
+}
+function closeSSRMenu() {
+	ssrMenuOpen = false;
+	ssrButton.setText('TRAVEL');
+	if (ssrMenu) {
+		game.removeChild(ssrMenu);
+		ssrMenu = null;
+	}
+}
+function checkSSRUnlocks() {
+	var currentScore = LK.getScore();
+	for (var ssrKey in ssrData) {
+		if (!ssrUnlocked[ssrKey] && currentScore >= ssrData[ssrKey].unlockScore) {
+			ssrUnlocked[ssrKey] = true;
+			// Save unlock status
+			if (ssrKey === 'russia') storage.russiaUnlocked = true;else if (ssrKey === 'kazakh') storage.kazakhUnlocked = true;else if (ssrKey === 'belarus') storage.belarusUnlocked = true;
+			LK.effects.flashScreen(0x00ff00, 300);
+		}
+	}
+}
 function checkCollisions() {
 	if (shieldActive) {
 		// Shield protects from all damage
 		return;
@@ -588,9 +800,11 @@
 	if (difficultyTimer >= 300) {
 		difficultyTimer = 0;
 		currentSpawnRate = Math.max(60, currentSpawnRate - 10);
 	}
-	if (spawnTimer >= currentSpawnRate) {
+	// Apply SSR spawn rate multiplier
+	var ssrSpawnRate = currentSSR ? Math.floor(currentSpawnRate / currentSSR.spawnRateMultiplier) : currentSpawnRate;
+	if (spawnTimer >= ssrSpawnRate) {
 		spawnTimer = 0;
 		var spawnType = Math.random();
 		if (spawnType < 0.4) {
 			spawnInterceptor();
@@ -599,8 +813,10 @@
 		} else {
 			spawnSAMSite();
 		}
 	}
+	// Check for SSR unlocks
+	checkSSRUnlocks();
 	// Spawn powerups occasionally
 	powerupSpawnTimer++;
 	if (powerupSpawnTimer >= 900) {
 		// Every 15 seconds