You can drag these little guys around and they do stuff The objective of the game is to upgrade the core (top center) enough times (3) until you can escape, which is how you win. Pimbot: Tiny with circular head and antenna pointing to your left, they are workers. You can put them to mine the mineral deposit, and another to work on the forge and turn those minerals into metals. BeeBot: Tough guys with a semicircle head, they work as walls. You can drag them, that's fine. BoomBot: MORTAR ROBOT!!! (will explode zombies) PursueBot: I doubt u will use this one much cuz of the price. He follows your mouse and kills any zombies in his way