Black Mesa is a re-envisioning of Valve Software’s classic science fiction first person shooter, Half-Life. Powered by Source Engine, You will re-visit the inaugural role of Gordon Freeman and his memorable journey through the Black Mesa Research Facility. Expect detailed environments to explore, a huge cast of characters and experimental weaponry. All-new music, voice acting, choreography and added dialogue give way to a more expansive and immersive experience than ever before.

Relive Half-Life in this highly acclaimed, fan-made recreation.
Black Mesa is the award winning fan-made re-imagining of Gordon Freeman’s landmark journey through the Black Mesa Research Facility. Relive Half-Life, Valve Software’s revolutionary debut, and experience the game that raised the bar for the entire game industry all over again!
Expect tremendously detailed environments, old-school tough-as-nails combat, and a gripping story with memorable characters. The all-new soundtrack, voice acting, choreography and dialogue create a more expansive and immersive experience than ever before!
The over 10 hour single player experience has greatly improved from the mod release; new visuals, new voice over, updated gameplay encounters, stability changes and more. Xen is not part of the Early Access release, but will be included as awhen it is ready.
Fight with or against your friends, in two game modes acrossiconic maps from the Half-Life universe including Bounce, Gasworks, Stalkyard, Undertow and Crossfire!
Use the same tools as the developers! Create your own mods, modes and maps for Black Mesa and Black Mesa Multiplayer and then share your work, and subscribe to others, on the Steam Workshop!
Collect the full set of trading cards, backgrounds, emoticons, and achievements! Steam Cloud, Steam Workshop and partial controller support!