Sid Meier's Civilization Revolution

"Civilization: Revolutions will support up to four players online using the simultaneous turn format of the PC game. Optional video and voice chat allows you to communicate more clearly with your opponents. The team is still trying to figure out how to orient the player's focus towards the important events that are occurring across the world but the smaller maps should make it easier for everyone to keep tabs on the important sectors of their empire. With four players as the maximum, the game includes options for free for all and two-on-two matches. There's even an option for one-on-one duels for players who don't actually have three friends."