All upgrades are free.
Moon rocks is a tower defence game, but NOT the typical tower defence you except! Build your ground defences against the space debris and hostile attackers. Produce minerals, and research for better technology to keep your planets well defended. Play a arcade/quick arcade game, or a full campaign and compete against 2 other space races to rule the galaxy!
Use the mouse cursor to play this game. The game contains a detailed help screen, and usefull mouse-over hint system to guide you through the game.