This is an excellent strategic game where you have to protect your fortress from enemies and in the end conquer theirs. The game is not divided into rounds so you get the money for killed enemies immediately as well as points for experience for which you can improve your defenses or build more attack units. If you collect enough experience you can move to another phase of technical development. So you can get from the Neanderthal man past medieval ages and modern times to the military weapons of the future. But protect you base very carefully because you cannot repair it except for the self repairs related to the transition to the higher technological level.