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The Binding of Isaac has sold more than two million copies to date

The Binding of Isaac co-creator Edmund McMillen recently revealed that the game has sold more than two million copies during a recent YouTube interview. Speaking with Northernlion, McMillen said that the game continues to build momentum. "In the first year we sold a million copies, and now we're already up to two million," McMillen said.

http://www.polygon.com/2013/4/20/4246254/the-binding-of-isaac-has-sold-more-than-two-million-copies-to-date