Are you brave enough to protect your city from the giant monsters that are going to invade it? Then get ready to take a sniper rifle and kill everyone who dares to approach the boundaries of your territory! You will have a limited number of bullets. So try to aim at the head to kill the enemy instantly before they reach your place. For every killed beast you will get points that will enable you to upgrade your weapon. Do not let terrible monsters step into your city and destroy it!