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.

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 (11)
Life signs 2015
Status Update

So, what's the status on Operation Black Mesa and Guard Duty?
They are both being worked on with full energy and equal priority.

Guard Duty is being developed as DLC / expansion for the bigger and more content-heavy Operation Black Mesa, so it won't require an extra greenlight campaign. So if you are especially interested in Guard Duty, be sure to check on Operation Black Mesa; we report on both mods side by side as they are very close together in terms of progress.

As a token of us being very much alive and kicking as ever (or early Christmas presents if you will), enjoy the rest of our previews:

Help Wanted

As always, we are looking for creative and enthusiastic people to join our development team:
- 3D artists (props) experienced with Source
- Skilled animators
- A seasoned webdesigner, -coder

If you're interested, please do get in touch at "" ! We look forward to hearing from you.

That's all for now, but there'll be more in the near future!
Until then, have a very Merry Christmas, happy holidays and a fabulous New Year!

Much love
Tripmine Dev Team

2014 Kickoff Update
  • Multiplayer Beta Release Q1 Cancelled
  • Multiplayer Progress
  • Singleplayer Campaign, Guard Duty
  • OBM: The Video Game?

Thanks for your support!
Tripmine Dev Team

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 (96)
Mar 19 @ 2:00am
If you can add any weapon in the game...
Apr 26 @ 12:56pm
Is it possible to tell me how far along you guys are.
Mar 2 @ 9:22pm
Idea: Replace of weapons in O:BM and GD
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o shit waddup - dat boi May 2 @ 7:13am 
What the fuck is going on with this project? Been checking up on this for years, why is it taking so long?
Lamron333 Apr 29 @ 2:28pm 
How long has this been in production? How much longer do they need? So ya prolly never. The last update was 6 months ago. Don't get your hope up!
djn04jr Apr 29 @ 1:47pm 
@Weiss why never? The voting stopped because VALVe has decided to help the guys making it.
Weiss ᶜᶻ Apr 23 @ 2:57am 
CamtheGamer: Never.... :-(
CamtheGamer Apr 20 @ 12:16pm 
Also do you know when this'll be released?
CamtheGamer Apr 20 @ 12:15pm 
First Black Mesa (Half Life 1 remake) now a remake of Half Life Opposing Force! If this is as good as Black Mesa then I would buy it.
Big Boss Apr 19 @ 6:06pm 
SUENA BIEN!!!!!!!!!!!! THAT SOUND GOD!!!!!!!!!!!!!!!!!1
edgy Apr 13 @ 6:52am 
Just Noticed the thing saying Blue Shift is being remade too as Guard Duty. FUCKING AWESOME! I am so hyped.
Weiss ᶜᶻ Apr 12 @ 11:10am 
Tohleto je mrtvej projekt, stejně to nikdy nevyjde... Už léta žádné nové screeny, nebo video ze hry, prostě nic... To si dřív v Black Mesa zahrajeme Xen, než tahle hra spatří světlo světa :-D
PROFESIONAL S.T.A.L.K.E.R Apr 9 @ 12:29pm 
i cant wait ! i want buy it right now and play it right now !