It is officially available on PC via Steam and was released for Xbox 360 .
Downloading "Left 4 Dead" through unofficial torrent sites is generally discouraged for several reasons: Left 4 Dead on Steam Left 4 Dead Torrent Download
Left 4 Dead is a cooperative first-person shooter developed by Valve. It focuses on survival horror gameplay where up to four players fight through hordes of zombies. It is officially available on PC via Steam