Relive Half-Life in this highly acclaimed, fan-made recreation.

Black Mesa is the award winning re-imagining of Gordon Freeman's landmark journey through the Black Mesa Research Facility. Re-experience the game that raised the bar for the entire game industry all over again!

The over 15 hour single player experience has greatly improved from the mod release; new visuals, new voice over, updated gameplay encounters, stability changes and all new Xen chapters!

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!

Fight with or against your friends, in two game modes across 10 iconic 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!