PORTAL 2
Portal 2 is a first-person puzzle-platform video game developed and published by Valve Corporation . It is the sequel to the 2007 game Portal and was released in April 2011 for Microsoft Windows , OS X , Linux , the PlayStation 3 , and the 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 (ARG) based on new updates 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. The game retains Portal ' s gamepl...

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