5. Diablo 3 - 6.3 million
Diablo 3 is the fastest selling PC game of all time. It sold 6.3 million copies in just the first week, 3.5 million on the first day itself. More than 10 million people have played the game since July 2012 and possibly more if you consider till date. It was a shame that the game found itself under many controversies with many gamers criticizing the DRM requirement.
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