Civilization 4

Civilization IV comes to life like never before in a beautifully detailed, living 3D world that elevates the gameplay experience to a whole new level. Whether playing multiplayer or single player, team play offers a new way of setting locked alliances that result in shared wonder effects, visibility, unit trading and shared territory that delivers a plethora of new strategic
and tactical options.

If you want to try this game:
http://game-megaupload.com/2008/12/03/civilization-4.html

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