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.

Greenlight is being retired. For more information on how to submit games to steam, refer to this blog post.
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 (16)
Level Design Dev Blog
Summer 2018 media update
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 (112)
Apr 21 @ 7:57pm
If you can add any weapon in the game...
Captain Eclair
Oct 9 @ 12:40pm
When we shall get early access
Bolek PhD
Jan 29, 2017 @ 3:25am
Multi-language Support
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UPEP Oct 11 @ 6:00am 
BOBY Oct 10 @ 8:03am 
Thank of to have answered :steamhappy:
Sorry for my english i'm french ;)
Mc.Sug4r  [author] Oct 9 @ 12:03pm 
@BOBY: Well, it´s a game. It will be stand-alone and only active Steam account is required.
BOBY Oct 9 @ 11:46am 
It is mod or game ?
WidowXSombra Sep 17 @ 7:58pm 
How much more needs to be done?
WidowXSombra Sep 17 @ 7:57pm 
Hope fully, it can be worth the wait.
Robrogineer Aug 29 @ 4:10am 
i absolutely can't wait to play this! when it releases i will also finally have some high poly opposing force models to use in animations and art (if you dont mind)
DogsRNice Aug 26 @ 11:12am 
the way you wrote that comment makes you sound like a cereal killer
Lamron333 Aug 26 @ 1:20am 
It will cost a lifetime,... Seriously look up when this was started. You think it's going to finnish,... HAHAHAHA. You must be a Trump supporter. Belief even though there is facts to say otherwize,... R.I.P.:overkill:
[ΖмBя.™] Matheus Aug 25 @ 10:25pm 
its going to be released in 2022.