You are Barney Calhoun, a security guard at the Black Mesa Research Facility. Unknowingly to you, the next few hours of your shift will change your life forever...
Re-live the exciting adventure of Blue Shift on the award winning Source Engine and prepare for the shift of your life!
Welcome to Guard Duty.


- As a total conversion mod, Guard Duty aims to be composed of entirely custom content
- All original maps re-created and re-envisioned for better realism and gameplay.
- Some maps are enlarge/extended to create a more lengthy and immersive game.
- Improved AI, making enemies smarter and even more dangerous than ever before.
- More enemy encounters to keep the action fresh.
- Scripted scenes with all the original Blue Shift characters to help bring the story to life.
- Textures and models that will push the limit of the Source Engine, to bring you as much artistic detail as possible.
- All new voices, sounds and music.
- Multiplayer, which may (or may not) contain various game modes.

And much more!

Image RSS Feed Latest Screens
Living quarters outbound Hazard Course Concepts
Blog RSS Feed Post news Report abuse Latest News: 2014 Kickoff Update

27 comments by Uphys on Mar 29th, 2014

Welcome to our first media update this year!

Read Full Article.

Multiplayer Beta Release Q1 2014 Cancelled

Our plan to bring you the multiplayer beta of Operation Black Mesa early this year didn't work out, regrettably. Several factors and circumstances forced us to completely keep it under the hood until further notice.

Multiplayer Progress

Multiplayer will feature classic maps such as Yard, Crossfire and Boot Camp as well as brand-new ones like Deptcharge and Gambit from day 1.
Currently in development: CTF mode and weapon placement.


Singleplayer Campaign

Development is running smoothly; those NPCs aren't going to animate themselves though! If you're interested in joining our team, check out the jobs page where you can find all positions currently open. We look forward to welcoming you on board!

Pit Worm's Nest

Remember Guard Duty (Blue Shift: Source)? We're making solid progress here too:

Living Quarters Outbound

OBM: The Video Game?

We've been given the option of developing our projects as full indie titles to be sold on Steam!
This opens up a whole lot of attractive possibilities to consider; however no decision has been reached yet as to this matter.

Alien Controller

M1A1 Tank

Thanks for your support in making all of this possible!

Until next time,
Tripmine Dev Team

Downloads RSS Feed Latest Downloads
Elevator to hell

Elevator to hell

Jun 15, 2011 Music 4 comments

An example from our soundtrack. This track is made by "Becket007".



Jun 15, 2011 Music 2 comments

An example of Xen track. This track is created by 8BitLord.

Sigh of relief

Sigh of relief

Oct 16, 2009 Music 6 comments

An example from our soundtrack. This track is made by "Mordekai"

Post comment Comments  (0 - 10 of 1,462)
TheDalekCaan Aug 25 2015 says:

There's another mod called "Black Mesa: Insecurity" that does the same job of re-creating Blue Shift. Perhaps you guys should team up?

+1 vote     reply to comment
Crypt Aug 25 2015 replied:

We're well aware of that mod, but that guy's goal is different.
He wants to recreate Blue Shift as an expansion for Black Mesa, we want to create it as a standalone game without any of the creative or technical limits Black Mesa presents.

+1 vote     reply to comment
TheDalekCaan Aug 25 2015 replied:

Oh, I see. You guys should contact each other, though. Maybe you can learn some things from each other! :3

+1 vote     reply to comment
TimelessHero790 Aug 8 2015 says:

This mod looks really promising. Am I mistaken or does this actually look a bit more beautiful than the Half-Life 2 Source Engine? Not too noticeable but I feel that there is a bit of a difference. Blue Shift wasn't perfect to be honest but it was still really good and also very gutsy having a lot to live up to following the masterpiece of the main game. Hopefully Guard Duty improves on the original without straying too far from it. Quick question, the mod isn't dead, right? I hope the answer to that is no. Best of luck to the Developer!

+1 vote     reply to comment
Bachu8 Jul 30 2015 says:

The mod looks really good so far. I just have one question: Will Barney have a voice? Taking into account that in the original mod he makes conversations with NPCs only that we can't hear him, and that he indeed talks in Half-Life 2, I think that he should have a voice in this remake. This is just my opinion and I'll understand if you disagree.

0 votes     reply to comment
chlide Jul 10 2015 says:

hey, I am looking forward to this.
Out of curiosity, how much is there left? :)

+1 vote     reply to comment
Crypt Jul 14 2015 replied:

There's no accurate way for us to calculate exactly what's left. Rest assured, we're working to get it finished as best and as quick as we can!

+1 vote     reply to comment
Guest Aug 18 2015 replied:

This comment is currently awaiting admin approval, join now to view.

Crypt Aug 22 2015 replied:

There's really no need. If you completely disregard the legal stuff, crowdfunding wouldn't be of much use.

It would have to be an amount that would allow the entire team to quit their jobs for an extended period of time to work full time in order to be of any good use, and that's not going to happen.

+1 vote     reply to comment
RockyBrown Jul 7 2015 says:

Can you meet Gordon?

+1 vote     reply to comment
MR.sugar Creator
MR.sugar Jul 9 2015 replied:

Just like in the original, yea.

+1 vote   reply to comment
TheDalekCaan Aug 25 2015 replied:

Which model are you using? :3

+1 vote     reply to comment
Post a Comment
click to sign in

You are not logged in, your comment will be anonymous unless you join the community today (totally free - or sign in with your social account on the right) which we encourage all contributors to do.

2000 characters limit; HTML formatting and smileys are not supported - text only

Half-Life 2 Icon
Tripmine Studios
Send Message
Official Page
Release Date
Mod Watch
Track this mod
First Person Shooter
Single Player

Latest tweets from @guardduty

An early WIP of Living quarters outbound by A_LegendaryEwok. This can give you idea how the content can change...

Mar 1 2013

The update is closer and closer guys. That's why we merge everything together. Like the twitter right now:...

Feb 21 2013

The Greenlight campaign will kick-start soon-ish!

Feb 16 2013

Guys, we have competition! Opposing force is being remaked for Minecraft ;)...

Feb 16 2013

The very first step towards our great goal !

Feb 14 2013

As people still keep asking again, again and again... We are not going to use Black Mesa content, nor cooperate...

Feb 4 2013

Přidal jsem nové fotky na Facebook

Jan 25 2013

Přidal jsem nové fotky na Facebook

Jan 20 2013

Just giving you heads up that we are not dead, we are just working behind the curtain ;).

Jan 18 2013

Happy new year everyone. Two members of TS meet today and with enough alcohol in blood, we consider leaking OBM...

Dec 31 2012

Embed Buttons

Promote Guard Duty on your homepage or blog by selecting a button and using the embed code provided (more).

Guard Duty
Guard Duty
Last Update
1 month ago
3,481 members