Mixing military abilities
Here a complex game to the fact that beside military management, you also have to deal with political, social and economical stuff. In short, you have to deal with all of the problems a country might go through in times of war. The game is marketed as a sequel to Supreme Ruler 2010, the game basically has no single-player campaign mode, but rather a skirmish like mode, where it's up to you of how you want to complete a scenario. While the mechanics of the game might be complicated, the game still proves to be a lot of fun, especially when you're playing with some friends, but don't think that this a game you can complete in about 1 or 2 hours.
