StarBaron - Campaigns

Even if the AI acts pretty stupid, at least in taking over other planets, this game is very long and not easy. In Skirmish mode you have 4 forces opposite to the beginning who own a certain number of stars. There can be different systems defense, missiles, fighter, economy, each of these systems have specific properties that should give you an advantage and bring the enemy to its knees. Take over the other opposing stars with your own strategy. The downside is you need quite a lot of CPU power for this!