Original game is in many cases either oversimplifying things, or even plain wrong.
It is an open-source community project that is free to download and play, but it requires a legal copy of Sid Meier's Civilization IV Beyond the Sword to be installed. Realism: Invictus is a mod for Sid Meier's Civilization IV that brings a different feel to the game through its realistic visual appearance, deepened game mechanics, refined play balance, and diversity of civilization-specific content.
