Supergiant Games reveals new sales milestone for downloadable role-playing game; 90 percent of sales came after original launch month.

During a presentation today at D.I.C.E. in Las Vegas (attended by Joystiq), Supergiant Games founder Amir Rao revealed Bastion has sold 1.7 million copies across all platforms.

Rao's discussion focused on how the company went about porting the game from Xbox Live Arcade to PC and mobile devices. He said not shipping the game simultaneously across all platforms did not hurt its sales.

In fact, Rao said over 90 percent of all Bastion sales came after the game's original launch month on XBLA during summer 2011. "We didn't lose an opportunity by not sim [simultaneously] shipping," Rao said.

Bastion is Supergiant Games' first project. It was released on Xbox Live during July 2011, with subsequent releases following on Steam, the Mac App Store, Google Chrome, and iOS. For more on Bastion, check out GameSpot's review.

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