The basic gameplay is very similar to other real-time strategy games such as the Warcraft series. The game did have some unique features. For example, in order to get any combat unit other than mercenaries, a worker had to be trained at a particular type of building. In order to receive a higher level combat unit, a lower level unit would have to be promoted at a specific facility. The purpose for these micro upgrades was to encourage more strategic and smaller conflicts. (wikipedia.org).