 Portal 2 is a 2011 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 are distributed by Electronic Arts while online distribution of the Microsoft Windows , Mac OS X and Linux versions is handled by Valve 's content delivery service Steam . Portal 2 was announced on March 5 , 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 . 
