Get the complete editions of Civilization 4, 5 and 6 plus a bunch more games for $15 in Humble Bundle's The Sid Meier Collection

I suppose you can't deny the results however, with Sid having lent his name to some of the finest PC games around. And now, ...
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Sid Meier's Civilization V - FAQs

6 million owners own this game on Steam. And of the Civilization franchise the games have sold around 22 milion units making the last one the best selling.