
Portal 2 is a first-person action/puzzle video game, developed by Valve Corporation. It is the sequel to the critically acclaimed 2007 video game Portal and was announced on March 5, 2010, following a week_long alternate reality game based on nevv patches to the original game. Though initially slated 4 release in the last quarter of 2010, the game was postponed to the week of April 18, 2011. The game will be released by Valve, through both retail and Steam, 4 Microsoft Windows and Mac OS X; PlayStation 3 and Xbox 360 versions of the game vvill be distributed by Electronic Arts. All versions of the game vvill become available simultaneously.
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