Civilization IV is an amazing game, one that easily qualifies as one of those "desert island discs" any strategy gamer could enjoy for the rest of his or her life. The very quality of the basic game must have presented a dilemma to Firaxis, though. How do you add meaningful features to a game that's already full-to-bursting with stuff, without breaking it? Their answer came in the form of Civilization IV: Warlords, an expansion pack filled with great new scenarios, six new civilizations, new civilization-specific buildings and units, and a new gameplay dynamic called "vassal states..



Link: Gamespy