In the Dreamcast title, the player can normally choose from two mobile suits, the standard RGM-79 GM, a decent all around mobile suit, or the heavier RGC-80 GM Cannon, a mobile suit with a cannon attached to its shoulder. If a certain mission was completed successfully, a third mobile suit, the RX-77D Mass-Production Type, a heavy mobile suit with dual cannons on its shoulders, and a machine gun in each hand, could be unlocked. The game has nine stages set all over Australia in an attempt to stop Zeon from developing and releasing Astaroth, a biological weapon capable of accelerating the growth of plant life on the Earth, turning it into an uninhabitable forest.