Traveling around the Galaxy, earthlings discovered a planet livable and built a fort post there. Seeing the settlement of the earth, they decided to destroy it and sent for this an armada of their combat robots. Now you in the game Tower Defense will need to command the defense of the settlement. At your disposal will be various machines capable of firing. If you select them on a special panel, you will need to place them in strategic places in such a way that they sweep through the whole terrain. Only in this way can you destroy all enemy robots.