Half-Life: Opposing Force is an expansion pack for Valve Software's science fiction first-person shooter video game Half-Life. The game was developed by Gearbox Software and published by Sierra Entertainment on November 1, 1999. Opposing Force is the first expansion for Half-Life and was first announced in April 1999. Randy Pitchford, the lead designer on the game, later noted that he believed Gearbox was selected to develop Opposing Force because Valve wanted to concentrate on their future projects. Over the course of development, Gearbox brought in a variety of outside talent from other areas of the video games industry to help bolster various aspects of design. Opposing Force returns to the same setting as Half-Life, but instead portrays the events from the perspective of a U.S. Marine, one of the enemy characters in the original game. The player character, Adrian Shephard.

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Call me crazy, but I decided to resurrect Heath Games and the Half-Rats mod series for one last mod. It was looking like I wasn't going to ever return to games, and especially Half-Life modding. I was burned out, didn't have it in me - Heath Games was basically dissolved, and there was a lot of negative feedback for the series that I let put a nail in the coffin...but after nearly dying from a gunshot, and losing almost everything, I decided I was going to turn everything around and dig the mod series out of the grave for one last hurrah - for those who have stuck around and were really disappointed by the dissolution of HG and the demise of HR mods. I didn't want to admit defeat by something as small as past mistakes, and the tiny, screeching voices of those who could never do what I do on a daily basis.

Half-Rats wouldn't give a damn, so why should we?

First thing's first - Changes for the better:

1. The lantern oil is getting the axe. The lantern has an auto recharge now.

2. We are capping the inventory at (5) of each item, but increasing the money cap.

3. We are adding new weapons, and fixing the issues with the old Parasomnia arsenal.

4. This story takes place during the day.

Heath Games is being joined by Myself, Netoxy, Shepard, Devin, and Zikshadow this go-round.



New Features?

Additionally, there will be help from friendly grunts, much like the ones seen in Opposing Force...since the entire story-line is centered on the arrival of the US Army. Sometimes they'll be helping you, and other times, you, Barnaby and Half-Cat are the ones who will need to rescue them!


Pretty neat, huh? There will be several missions to undertake before the big finale, and they shall include elements/objectives like:

1. Support

2. Search and Rescue

3. Civilian Aid

4. Recon/Investigation

5. Assault

6. Take and Hold

It's up to you if/who you decide to take with you on each objective - as you'll have a few troops at your disposal - so choose wisely. I know you people, so we won't make it too hard in case you decide to go it alone and ignore a fair warning!


As you can see, this guy needs a lot of...civilian aid...don't think he can walk this one off.

Preliminary Tests:

By the way; I tested the new grunt models, as well as a couple others in Opposing Force, too. Here's some shots:

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New/Old Enemies?

As mentioned before, some older enemies are making a comeback...


Before and after...

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Poor Phipe didn't deserve that...

And...WHO'S THAT DEMON? Play and find out!


As you can see, we are making quick progress. One thing is for sure, we aren't going to rush. There is no deadline currently, and we are going to keep it that way. Thanks for your continued support!

Pic of the Day:


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Half-Life:Opposing Force Demo

Half-Life:Opposing Force Demo


This is the official released Demo of Half-Life:Opposing Force, Released shortly after the full game came out, It contains a full hour's worth of play...

Logend of Lank Proto 1

Logend of Lank Proto 1

Logend of Lank Demo

This s the canvas for the future versions of the game.

Half-Life Studio Model Decompiler v1.1(Win32, Linux)

Half-Life Studio Model Decompiler v1.1(Win32, Linux)

Modelling Tool 4 comments

Half-Life Studio Model Decompiler by Flying With Gauss.

Half-Life Ultimate Damagetweaks 1.0.1

Half-Life Ultimate Damagetweaks 1.0.1

Patch 1 comment

Several changes on the weapon and player, medkit values etc.

Sandpit v4.1

Sandpit v4.1

Full Version 34 comments

Sandpit v4.1 adds a new Sprite Menu, some Opposing Force entities, entity scaling and more.

Red shift Version 1

Red shift Version 1

Quiver: Red Shift Demo

This is a short group of maps from the main storyline (some unfinished and some completed.) Make sure to check out the training room. Only thing you need...

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Opposing Force M136 At4

Opposing Force 80's action movies weapons pack

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opposing force in 2020

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I've gotten tired of not being able to reliably find games for old Gold Source (GoldSrc, HL1, Half Life 1) mods or Source (Half Life 2, HL2) mods, so I made a discord about just that. I am also trying to make this place an informational hub. I'm trying to centralize and unite the multiplayer mod communities for all of the various multiplayer mods out there. We play a mod of the week every Friday/Saturday.

Check us out.


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It's surprising this expansion pack is gonna turn twenty this year!

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a guy from the modb community made a unofficial blue shift port for ps2, it will be possible to leave an unofficial port of opposing force for ps2
his name is supadupaplex
I also saw and already played a game that you enter into the skin of a black table visitor, the name of the game is half life visitors, he is in this group to download, works only via steam, it will be possible someday convert it to ps2.
Nothing, as you can dream

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One of the best expansions of the original Half-life story.

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Opposing Force is Canon.

Fight me.

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I wish Valve still considered it as canon.

I would've love to seen Shepard return in Half-Life 3. 😿

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Highest Rated (3 agree) 10/10

One of the best Expansion Packs out there for any PC Game!

Jan 15 2018 by SweetJuleka

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