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 (12)
Operation Black Mesa January update
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

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 (109)
Jan 17 @ 4:16am
If you can add any weapon in the game...
Sep 18, 2016 @ 5:04am
When we shall get early access
Agent Bolek
Jan 17 @ 12:20pm
How much will be the price?
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Levi's Jeans ™ Feb 11 @ 7:28am 
When is this coming out. I can't wait anymore. I want Early Access of this.
Phazel [FR] Feb 10 @ 8:09am 
I hope there will still be female headcrab zombie like in the 2009 Artworks of the "Operation: Black Mesa" MODDB page. Without them there are really less realism. Headcrab are sexits, really ^^ ?
10/10 Best water fountain in a video game to date. (this is intended as a joke. If Valve released an image of grass and said it came from half llife 3 I would be amazed. Cool water fountain.)
Tobyther Feb 8 @ 7:30am 
I can't wait for an early access of this.. and the end of Black Mesa
Oğuz Kaan Aybak Jan 31 @ 4:00pm 
Also vortigaunts does not have the green things on his body in the picture, you should add it.
Oğuz Kaan Aybak Jan 31 @ 3:55pm 
I mean Guard Duty
Oğuz Kaan Aybak Jan 31 @ 3:54pm 
I don't know if you look at the comments here but I think Guard Dut should not be activated using main menu instead it should have seperate exe.
2laggy4meh Jan 30 @ 11:08pm 
Duck Tear Popper Jan 28 @ 11:33pm 
I can't wait for this to come out. Gordon Freeman got enough screen time.
Winter Jan 28 @ 4:26pm 
Проект давно сдох