Steam News announces that the SteamOS edition of Tomb Raider is now available as a free update for everyone who owns the adventure sequel on Steam. Word is: "Tomb Raider explores the intense and gritty origin story of Lara Croft and her ascent from a young woman to a hardened survivor. Armed only with raw instincts and the ability to push beyond the limits of human endurance, Lara must fight to unravel the dark history of a forgotten island to escape its relentless hold."