Black Mesa is the fan-made re-imagining of Valve Software’s Half-Life. You are Gordon Freeman, a theoretical physicist at the Black Mesa Research Facility. When a routine experiment goes horribly wrong, you must fight your way through an interdimensional alien invasion, and a bloodthirsty military clean-up crew in order to save the science team… and the world! Create your own mods, models, and maps with the Black Mesa Source SDK, and share it with the community on the Steam Workshop. Collect the full set of trading cards, backgrounds, emoticons, and achievements! Featuring Steam Cloud, Steam Workshop, closed captions in multiple languages and partial controller support.

Black Mesa Overview
- Click the download button below and you will be asked if you want to open the torrent. Select yes, and let the download start. If you don’t have a torrent application, click here to download uTorrent.
- Once Black Mesa Torrent Download (v1.0 – CODEX) is done downloading, right-click on the torrent and select “Open Containing Folder”.
- Double click inside the Black Mesa Torrent Download (v1.0 – CODEX) folder, extract the .iso with WinRAR and run the setup.
- Click “Copy contents of CODEX directory to installdir” and then click install. Wait for the game to install. Be sure to disable any form of anti-virus so no files get corrupted.
- Once complete, launch the game, have fun, and play. If you encounter any problems, run the game as administrator and be sure to update your video drivers and have DirectX installed which you can get here.