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 (106)
Aug 20 @ 7:33pm
If you can add any weapon in the game...
Sep 18 @ 5:04am
When we shall get early access
Agent Bolek
Sep 13 @ 7:16pm
can u add multiplayer in story mode? just like portal2.
< >
Ahmad Sep 23 @ 5:53pm 
@Mr.Moseby no they're not
Mr.Moseby Sep 22 @ 1:16pm 
Are these the same guys as black mesa?
STiNKY Sep 22 @ 2:44am 
I am really looking forward to this game. Take as much time as you need to complete it, we will always support you! I'd rather have a perfectly polished game than a rushed and incomplete game! <3
Smike Sep 20 @ 6:59am 
hey Mr Suger is it possible that you can show a little gameplay of the game ? when will this game be out this years or next ? any new of the game coming too early acces ? so people can test the game out for any bugs and problems in it?
MR.Sugar  [author] Sep 18 @ 2:20am 
Hey Smike, no news yet, but we will release another quite soon, keep checking our forum ;)
Smike Sep 17 @ 1:49pm 
Hello devs any news on this game or when its coming out ?
MR.Sugar  [author] Sep 13 @ 9:02am 
Hey Lumenade,
we are not dead at all. Actually, 2016 seems to be very productive year for us :). We know there is lack of real big updates, though we recently started dev.blogs. First one is already released and another one is already almost done :)

We are also actively answering questions on our recently launched new forum, so maybe you can check it out and find the new there.
Is this Mod Dead? If not
Is it still being working on till NOW?
No new updates about this mod :/?
Moss Sep 7 @ 4:27pm 
Very impressive tech in this game, I'm still impressed by what people manage to pull off with Source. Considering how underrated OF is and how the latest versions of GoldSrc broke areas of it, I'm definitely interested in giving this a shot when it hits Steam.
Spooky Elite Sep 4 @ 1:15am 
opposing force also deserves a sequel