Valve har släppt Portal 2 samtidigt till Mac, PC, PS3 och Xbox 360. Bara att köpa och spela genom Steam.

”Portal 2 marks the first time since Steam’s arrival in May 2010 that Valve has included the Mac in the launch of a major new title; it’s also available on PC, PlayStation 3, and Xbox 360. Portal 2 also supports the Steam Play licensing system, so you can purchase it on one desktop platform and play it on the other at no extra cost.”