I know this has been asked before, but from years ago and might be out of date. It can be any price, but has to have the replay feature, the pausing feature, and the zooming in feature to see the close details. The graphics have to be good or above, and it can't have too much glitches or bugs. The AI has to be challenging. The troops have to be realistic and diverse. If there are any mods, preferably free, count that as part of the game.