The basic gameplay concept of Civilization IV is the same as that in all other Civ-like games: you take charge as the leader of a band of wandering people and set out to found an an empire of cities, armies and scientists with as goal to eventually rule the world. Compared to Civ3, Civilization IV will introduce some new concepts, such as Religion and Great People, change some existing ones, such as combat and technology, and leave others pretty much the same, such as diplomacy and Wonders. Civlization IV: Warlords adds in addition to that the concept of Vassal States.
Civ4 General
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