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 23 @ 12:29pm
If you can add any weapon in the game...
Princess Luna
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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Captain Walker (Sean) Aug 24 @ 5:19pm 
i have been waiting for this game ever since i found out about it by looking after BM:S any you have gained a follower IT LOOKS AWESOME keep it up and good job!
dark caboose Aug 23 @ 11:55pm 
hope fully it is released soon
Carnage Aug 23 @ 7:41am 
Agreed with @King Tsunami
You guys are a great awesome team, Maybe you guys can recreate HL2 beta after this project
Tabajara Aug 21 @ 1:00pm 
@Anthony M.
As Mr.sugar said, we can't tell the release date yet, i'm sorry.
King Tsunami™ Aug 21 @ 9:59am 
You guys should recreate the Half Life 2 beta.
dark caboose Aug 21 @ 3:30am 
please release
Anthony M. Aug 20 @ 10:37pm 
When will it be released?
[TSC]ShadowkILL Aug 20 @ 6:48pm 
The Shotgun model i like but in the HL series there is no butstock it wouldnt really make sense if the original shotgun model wasnt in it
arnold schwarzenegger Aug 20 @ 1:19pm 
Need to be released
eXplosive Aug 18 @ 6:09pm