Valve's bid to lure gamers away from Microsoft's platform just got a little sweeter: Left 4 Dead 2 is finally available on Linux. Despite early appearances in early leaks, the game has been absent from Steam's Linux compatible library. The wait might have been worth it -- early ports of the game apparently only ran at six frames per second, but it eventually surpassed its Windows counterpart. Now, Valve is looking towards its community to fine tune the port even further, offering a fully functional beta client to Steam users who already own the game. Although the focus here is Linux compatibility, the company is offering the beta to Windows and Mac users as well, and says that running the game on any system helps with testing. Ready to take down the horde? Fire up Ubuntu and get started. Otherwise, you can check out the company's official announcement at the source link below.