This game has been Greenlit by the Community!

The community has shown their interest in this game. Valve has reached out to this developer to start moving things toward release on Steam.

Greenlight is being retired. For more information on how to submit games to steam, refer to this blog post.
Operation Black Mesa
Platforms: PC, Mac, Linux
Languages: English, Czech, German, Russian
Mar 22, 2013 @ 2:15pm
Dec 21, 2015 @ 2:03pm
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Operation Black Mesa (Opposing force: Source)

Operation Black Mesa is a total remake of Half-Life: Opposing Force. Utilizing the Source engine, Tripmine Studios plans to recreate the Black Mesa Research Facility from the ground up, as seen by the protagonist, Adrian Shephard.

-Mod DB – Top Unreleased Mod for 2007 (5th place)
-Mod DB – Honorable mention for Top Unreleased Mod of 2009
-Mod DB - Mod of the year 2010 - Players Choice (3rd Place)
-Mod DB – Honorable mention for Top Unreleased Mod of 2011
-Mod DB – Best unreleased Mod of 2013

This project is not related to the Black Mesa project, a remake of the original Half-Life. For more details, please read FAQ at our website:


VALVe software originally had plans to port Half-Life: Opposing Force into the Source engine (announced at E3 2004) much like Half-Life: Source. However, seeing the results of Half-Life: Source, we decided to take the task into our own hands.
If we manage to get our game on Steam, it won’t only bring in the advantages in form of SteamWorks implementation, easy installation and automatic updates, but also will help to make the community around the game much bigger. That will bring many advantages, including populated servers in the multiplayer. While on Steam, the game would be available up to 50 milion customers using the Steam services!

Planned Features
• As a total conversion mod, Operation Black Mesa aims to be composed custom content entirely.
• All original maps re-created and re-envisioned for better realism and gameplay.
• Some maps are enlarged / extended to create a more lengthy and immersive experience.
• Improved AI, making enemies smarter and combat more dynamic.
• More enemy encounters to keep the action fresh.
• Scripted scenes with all the original Opposing Force characters to help bring the story to life.
• Textures and models pushing the limits of the Source engine, to bring you as much artistic detail as possible.
• New voice acting, new sound assets and a new soundtrack.
• Multiplayer that will bring back the classic gameplay, but also many new features, maps and game modes!
• Guard Duty, a remake of Half-Life: Blue shift is also being developed as DLC for Operation: Black Mesa.
Popular Discussions View All (110)
Dec 28, 2017 @ 7:08am
If you can add any weapon in the game...
No One
Sep 18, 2016 @ 5:04am
When we shall get early access
Bolek PhD
Jan 29, 2017 @ 3:25am
Multi-language Support
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RobfishRising 18 hours ago 
This must happen
ARAS /S/ 21 hours ago 
SλuceBot Mar 17 @ 2:44pm 
is it that hard to read the other comments
SλuceBot Mar 17 @ 2:35pm 
Is this stil in active development? i'd really love to see a remake of opposing force :)
Chris  [author] Mar 12 @ 12:29pm 
Nearly every day?
kriplkára Mar 12 @ 11:16am 
some progress when?
9seed Mar 10 @ 7:13am 
No, still going.
Biggity Swigger Mar 10 @ 7:07am 
Wait this is still going on? I thought it was scrapped back in 2014
Lamron333 Mar 5 @ 6:05pm 
@Real style and each other, nobody asked you anything. That question was for the developers idiot! :steamfacepalm: