Enjoy playing a great shooter game! Attack is the best way of defence. The only way to survive is to destroy all approaching aliens or they will reach and capture you. New level starts when all enemies are killed. There are two types of cartridge - ordinary and armour-piercing. Using the second type of cartridge, you can kill any enemy from the first hit. You get 1 point for each hit if, of course, it has a result. Free to play and download!