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
Recent Announcements View All (13)
New OF2A1 Dev Blog
Operation Black Mesa January update
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)
Jun 4 @ 11:09pm
If you can add any weapon in the game...
Sep 18, 2016 @ 5:04am
When we shall get early access
Agent Bolek
Jan 29 @ 3:25am
Multi-language Support
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.-Gasthe-. Jun 23 @ 9:07pm 
Sorry for "BEETAA PLIS" I Feel bad for that
I Love OF, And i love the project of OBM
Thanks for the Remake :3
9seed Jun 20 @ 1:15pm 
It's still going.
ViRuS* Jun 20 @ 12:36pm 
Still working on Operation Black Mesa ? or is it dead?
9seed Jun 7 @ 10:27am 
They have. Check some of the popular mods for BM.
xXswaggeryolopantzXx Jun 7 @ 8:47am 
Well then. Good luck with the project! By the way, you guys have to be taking some inspiration from Black mesa source. Most people on the development team must have played it. :P
Chris  [author] Jun 7 @ 8:43am 
It would be complicated from a legal standpoint, and simply boring for us because we want to make our own content. That's why we're doing this.
xXswaggeryolopantzXx Jun 7 @ 8:41am 
I was thinking about sharing textures and things like that. The developer gearbox that created opposing force created the game from assets by valve's half life right? They added elements of course, but the base game was from half life. It would be weird if you played the Black mesa remake and then the Opposing force remake which are both the same Black mesa setting but then feeling like you are in completely different plces even if they share the name. I'm not critizising this, but i just thought that sharing textures etc would make the development easier...
Chris  [author] Jun 7 @ 8:33am 
Merging two completely unrelated teams with entirely different goals and workflows is not natural, it's counterintuitive and will ultimately slown down the prouction of everything both of our teams are doing.
xXswaggeryolopantzXx Jun 7 @ 8:08am 
Why not cooperate with the BM team? It seems natural...
9seed Jun 4 @ 5:32pm 
yeah, just look at no man's sky.
besides, the best time to build hype would probobly be after the BM team finishes xen.