Portal 2 was released on VHS.
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 .	Portal	Portal (video game)	Steam	Steam (software)	alternate reality game	alternate reality game	Potato Sack	Potato Sack	distributed computing	distributed computing
