 As of February 2014 , SteamOS , Valve 's own Linux @-@ based operating system , supports Portal 2 and its predecessor , as do most modern Debian @-@ based Linux distributions on its services via the Steam client . Released as a Beta in early 2014 for Linux distributions , it holds all of the same traits as the other versions , retaining cross @-@ platform play , split screen and fully native controller support . 
