To land a barrage of meteorites that threaten Earth. If they are not destroyed, the earth will perish. Your task is to construct a set of guns that will destroy meteorites on approach to land. At the beginning of the game, you will not be a big-budget, on which you will build its first security gun. In consequence of the destruction of meteorites, you'll get the money that you use to build additional facilities. Stop the catastrophe, or the Earth will be destroyed. Control of the game with the mouse.