Empires: Dawn of the Modern World. It was made by the team that makes Empire Earth. It's similar, only instead of having a huge span of insane time periods, it has less (medieval, gunpowder, imperial, WWI and WWII) and puts alot more detail in each age. The game has an insane amount of potential, as there are far less restrictions on what you do than modern RTS's. Me and my friends have had loads of fun just playing the WWII portion of the game. Most of our games can last a minimum of 5 hours. The only thing I dislike about the game is the way the civilizations are set up (the Franks exist even up to the Imperial age, and Korea and China just turn into western countries) I wish they had left out Korea, and had Japan instead, and taken it all the way across the time periods, including WWII.