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Portal 2 is a first-person puzzle-platform video game developed and published by Valve Corporation. It is the sequel to Portal (2007) and was released on April 19, 2011 for Microsoft Windows, OS X, Linux, PlayStation 3, and Xbox 360. The retail versions of the game were published by Electronic Arts, while online distribution of the PC versions is handled by Valve's content delivery service Steam. Portal 2 was announced in March 2010, following a week-long alternate reality game based on new patches to the original game. Before the game's release on Steam, the company released the Potato Sack, a second multi-week alternate reality game, involving 13 independently developed titles which culminated in a distributed computing spoof to release Portal 2 several hours early.
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