Valve has released a Linux version of Counter-Strike: Condition Zero, the company's fifth port for the operating system.
Condition Zero joins Team Fortress 2, Half-Life, Counter-Strike 1.6 and Counter-Strike: Source, with plenty more to come. There are currently 80 titles available for Linux on Steam.
Valve's forthcoming Steam Box will be based on Linux, so it's likely that Valve will port all of its games to the operating system in time for the device's rumoured 2014 launch.
Valve's own Steam Box is expected to be shown at this month's Game Developers Conference.