There are so many multiplayer possibilities with Civilization IV, that this requires two entries in the list. Aside from all the neat tweaks to keep things going smoothly, there are now lots of new gameplay possibilities. Team games are now easily set up, and teams have new ways to communicate with each other, from annotating each other's screens (you can literally draw lines to tell people where to go – think of strategizing in football) to sending little pings to alert teammates of important events happening around their map. Support for voice over IP allows players to talk to each other while they play, whether it's for genuine communication or just plain smack talking.

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