Research requires a percentage of your profits, tracked easily through the main building's graph icon. Create and use a school to train people for operating other buildings while researching new units and ideas constantly. Gameplay is familiar to fans of the real-time strategy genre. but in a different setting where all action is on land and you don't have to deal with ships. The game is somewhat reminiscent of 1602 A.D. Amazons & Aliens has amusing characters and all three species have unique looks. RTS games take on a life of their own when the right components are added.