You are a N-1 unit (a repair and defense bot) that has reached the planet Zima. You come in the name of those who want to colonize this alien dune. Your mission is to protect 4 solar powered towers, but beware... During the night, the highly sensitive to sun, natives of Zima, might come to destroy the unwanted technology on their homeland. And remember: Energy to a bot is like water to a lost man in the desert.