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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Since we are in the new year I decided to post an article informing everyone about the development of OP Assault.


2015 Has been a great year for the mod. I managed speed up the development a lot last year and which resulted in the release of the long awaited demo. After the demo was released I was working only on the maps shown in the demo to further improve gameplay and fixed a lot of bugs to provide smooth experience and I'm quite happy with the results :)

After my last release v1.4 of the game I've finally managed to continue working where I left off. I also decided to change the development of the mod. From now on with every "Mission" I completely map I will be releasing a version update so players can play the new content without waiting forever and also provide feedback if needed.

And this is where my last announcement comes. I released a video trailer for the upcoming version of the game which includes two new missions. Estimate release date is unknown as of this moment but it shouldn't be long.

Now for those that didn't know about v1.4 till now I recommend you download it. It contains a massive list of improvements /fixes.

DOWNLOAD V1.4

Opposing Force Assault v1 Alpha Demo


RTSL: 2015 Awards

RTSL: 2015 Awards

News 7 comments

Check out the winners of the Run Think Shoot Live, Awards 2015.

Life Signs 2015

Life Signs 2015

News 29 comments

Operation Black Mesa and Guard Duty are back! It's been a very busy year and here's what we've been up to.

Alpha Demo available

Alpha Demo available

Opposing Force Assault 7 comments

Well here it is. The long awaited alpha demo I've been talking about.

Military Duty - Mod Release

Military Duty - Mod Release

Military Duty 14 comments

Hello people. Today I'm proud to announce you the release of a new Hl1 Opposing Force mod.

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[OUTDATED] Unknown Opposing Force [v1.0]

[OUTDATED] Unknown Opposing Force [v1.0]

[Milestones] Opposing Force Full Version 0 comments

The old abandoned version. I'm not sure 100% that it will work correctly.

HL Sierra SD MODEL PACK

HL Sierra SD MODEL PACK

Full Version 0 comments

This SD Pack is for the old school sierra half-life Version, to replace that old ugly low definition pack, I did not make this I only repacked it into...

HL : New SD Model Pack

HL : New SD Model Pack

Full Version 6 comments

Half-life New Super definition pack, done this long time, re-uploaded to be download, this all model and redone, and repacked, special thanks to Diamondd...

Half-Life 1 WON 1.1.1.0 Patch

Half-Life 1 WON 1.1.1.0 Patch

Patch 10 comments

With this, you can upgrade Half-Life versions and even downgrade it. You can only use this in the WON version.

Opposing Force Assault v1.4 Alpha Demo

Opposing Force Assault v1.4 Alpha Demo

Opposing Force Assault Demo 5 comments

This is an Alpha demo version so the game is not complete and will be longer , expect bugs , crashes ... ect. Bug reporting is always welcomed to improve...

Opposing Force: Source Models 1.0 Beta

Opposing Force: Source Models 1.0 Beta

Demo 1 comment

Ok before i say anything about this i need to say this: AW HECK YA ITS OUT!!! Its not out its just what i made so far OH that reminds me sense this is...

Post comment Comments  (40 - 50 of 70)
REENIGAV
REENIGAV

can somebody upload Opposing Force non standalone? or is illegal? i mean a download like they hunger.

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SourHyperion1
SourHyperion1

It's Illegal, Opposing Force is still a working title and costs i think 10 US dollars to buy

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Wonkehcheetah
Wonkehcheetah

why can you not get half life?

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Xen-28
Xen-28

OPPOSING FORCE ROCK !!!!!!!

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Riker7
Riker7

i have the Jed's Half-Life Model Viewer 1.36
and ai saw the blackops osprey
in the game i cant see it ...

Reply Good karma Bad karma+1 vote
JrComissarValvatorez
JrComissarValvatorez

It's just one of the more redundant things in the Opposing Force files that isn't seen in game.

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Headshot_
Headshot_

I think its a good addon and I real like the training :D

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REENIGAV
REENIGAV

half life opposing force is one of the best half life

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callea
callea

Why dont ANYONE make a port of it? to the orangebox engie? like Heart of evil source.

Reply Good karma Bad karma-3 votes
ytres
ytres

operation black mesa, coming eventually.

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m82sniper
m82sniper

There are people re-making it on the Source engine, but a straight out port is just retarded.

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ytres
ytres

Go buy it on steam.

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Half-Life: Opposing Force
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