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
Mar 22, 2013 @ 2:15pm
Sep 12, 2013 @ 11:16am
Recent Announcements View All (10)
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

Website down
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

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!
Popular Discussions View All (40)
Aug 29 @ 9:28pm
If you can add any weapon in the game...
Aug 25 @ 2:45pm
Should the game be longer than Opposing force?
Aug 25 @ 6:35pm
When will this game be out?
Potato Skin
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TheGamer250 Sep 27 @ 3:30pm 
is Amazing :D
Tabajara Sep 26 @ 6:07pm 
@MetroPWN: That would be for Guardy Duty (Blue Shift).
MetroPWN Sep 26 @ 8:02am 
Why do Grunts attack you they are friendly unlike the blackops
Silver Edge™ Sep 23 @ 2:29am 
quick question, how much progress until the game might be released?
eat a potato Sep 22 @ 1:56pm 
thank you
MR.sugar  [author] Sep 22 @ 1:49pm 
@eat a potato: You are more than welcome to ask questions, though before you ask, you should simply read the description and visit our website to check out frequently asked questions. They would answer your questions for sure.
eat a potato Sep 22 @ 1:39pm 
so wont talk ok:>
eat a potato Sep 22 @ 1:38pm 
ok srry i just love opposing force and i want to know if its like the real game!
Thaddian Sep 21 @ 4:18pm 
@eat a potato: You didn't have to fill up 1 whole page just to ask a frickin' question, just put it on 1 comment plz.
Laurence "Prophet" Barnes Sep 20 @ 9:56pm