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Portal is a single-player puzzle-platformer developed by Valve Corporation. The game was released in a bundle package called The Orange Box for Microsoft Windows and Xbox 360on October 9, 2007,[3][4] and for the PlayStation 3 on December 11, 2007.[7] The Windows version of the game is also available for download separately through Valve's content delivery system Steam[2] and was released as a standalone retail product on April 9, 2008.[8] A stand-alone version called Portal: Still Alive was released on the Xbox Live Arcade service on October 22, 2008; this version includes an additional fourteen puzzles. A Mac OS X version was released as part of the Mac-compatible Steam platform on May 12, 2010.[10]

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