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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2bases - OP4CTF and TFC

2bases - OP4CTF and TFC

Multiplayer Map 2 comments

2bases is a simple Black Mesa like map for Scientist Hunt, Opposing Force, and Team Fortress Classic. It's a small map fit for 6 players or more and takes...

2bases 1.3

2bases 1.3

Multiplayer Map 1 comment

2bases is a simple Black Mesa like map for Scientist Hunt, Opposing Force, and Team Fortress Classic. It's a small map fit for 6 players or more and takes...

AREA MOD

AREA MOD

Singleplayer Map 0 comments

New map created by Xeno-J works in "Opposing Force" and "Sven-Coop" and "Residual Life". in full "AREAMOD" includes. Human_Grunt, Human_Grunt_Ally No...

Beta Zombie Recreation

Beta Zombie Recreation

Animal Model 1 comment

I took the dreamcast zombie, edited the textures and resized and shaped the model to replicate the one from the beta.

Black Mesa Otis v2

Black Mesa Otis v2

Animal Model 0 comments

Removed Chrome, change the texture, desert eagle, remove the helmet otis, change the color vest (it looked very blue), Add, beard to the otis,

CenBlas - HL1OF

CenBlas - HL1OF

Language Sounds 0 comments

Removes verbal blasphemy Place the folder in the installed folder. Should be SteamApps\Opposing Force.

CSO Female Hands (HD Valve Weapons) - OpFor

CSO Female Hands (HD Valve Weapons) - OpFor

Skin Pack 0 comments

I did this pack as a follow up to my earlier skin pack, where I fitted the CSO Female Hands to the Valve HD Weapons.

cs_trepidation

cs_trepidation

Multiplayer Map 0 comments

It's amazing how a map can evolve. This, for example, began as a coop project by myself and Urby under the working title "ss_pijamas." The "ss" stood...

Epic huge props pack for goldsource!

Epic huge props pack for goldsource!

Models Pack 2 comments

(I do not own any of this, i just modified some of them) I hope this helps goldsource developers, but know that you can't use this for commercial purposes...

Floating City OP4 Edition *EXPANDED EDITION*

Floating City OP4 Edition *EXPANDED EDITION*

Multiplayer Map 0 comments

My first Multiplayer map ported to OP4 *Desc from original* Inspired by a map featured on twhl.info My first multiplayer map that I've released in all...

Gold Source Anthology Add On Content Pack

Gold Source Anthology Add On Content Pack

Multiplayer Map 3 comments

This Pack Contains Multiplayer Map Packs, SDK Tool Kits & Game Fixes.

Gonome

Gonome

Animal Model 3 comments

The gonome found on the case closed pack of trusty crowbar. It works for opposing force.

Half Life Opposing Force Map Pack

Half Life Opposing Force Map Pack

Singleplayer Map 0 comments

The new map created by Jocker's and Xeno-J includes seven maps for "Opposing-Force" works on all versions Sven-Coop

Half-Life Collection Golden Definition Pack

Half-Life Collection Golden Definition Pack

Models Pack 18 comments

Half-Life Collection Golden Definition Pack 1.0 enhance the Golden Source models and solve some problems. For more details check the media section. Half-Life...

Half-Life: Further Data + dm_office

Half-Life: Further Data + dm_office

Multiplayer Map 6 comments

Disclaimer: I take no credit for developing this addon or putting it on the internet. All credit goes to Valve, Gearbox, and Ryan Finnie. I am only placing...

Hev charger & health charger from Half-life Decay

Hev charger & health charger from Half-life Decay

Prop Model 9 comments

those 2 models with they're animations, they're not made by me, they have animations and a retexture could make them look better, but im not going to...

Hornetech

Hornetech

Weapons Model 2 comments

A technological abomination. Replaces the Hornetgun.

Improved Gearbox Desert Eagle

Improved Gearbox Desert Eagle

Weapons Model 7 comments

Has anyone else ever wondered why Opposing Force's desert eagle looked nothing like a desert eagle? I have, and so I've decided to correct this. Enjoy.

Kimono's Glock 17

Kimono's Glock 17

Weapons Model 3 comments

A Glock, model 17. Every possible combination of hands, muzzle brake and LASER Aiming Module via 57 compiles.

Later Alpha MP5 Replica

Later Alpha MP5 Replica

Weapons Model 3 comments

My attempt at a late alpha mp5. Comes with sound, real model, and textures. Extract v_9mmar.mdl to models folder, and hks1,hks2,hks3 in the sound/weapons...

Mechanized Death: Army of None

Mechanized Death: Army of None

Singleplayer Map 1 comment

4 maps. Hey, don't blame me. They're great maps right up until Half-Life loads them. I'm not a programmer or anything but I'm pretty sure there's an actual...

Mission Impossible

Mission Impossible

Singleplayer Map 0 comments

(note: there is a black screen for about a minute in the begginning, just wait it out) This is a 4 map mod that can be started by opening up the console...

MP5 M203

MP5 M203

Weapons Model 5 comments

TOTALLY ORIGINAL NEVA BEEN DONE BEFO' New animations though. So there's that.

MP5 M203 LD

MP5 M203 LD

Weapons Model 3 comments

The same completely original idea, now available in lo-fi. Fo' rizzle.

My first Opposing Force map!

My first Opposing Force map!

Multiplayer Map 4 comments

Please enjoy this map made for Half-Life Opposing Force! Ok, to get this straight, I'm not very good with coming up with good-looking maps, but this should...

New Geneworm

New Geneworm

Animal Skin 9 comments

a retexture of the opposing force's geneworm.new things coming soon...........

New Maps Omesa

New Maps Omesa

Singleplayer Map 1 comment

The new map created by Ted321 map works on "Half-Life Opposing Force" and "Sven-Coop All versions"

New Massn

New Massn

Players Model 3 comments

Here is a model I made six bloody years ago and never found somebody to texture it. That was until last week when Swaggletooth was nice enough to make...

New Skins Hecu

New Skins Hecu

Models Pack 2 comments

The new skins created by Jocker's model works on "Opposing Force" and "Sven-Coop" is the original texture of "Half-Life Source created TheUnbeholden"

OP4 DeamonD Pack

OP4 DeamonD Pack

Models Pack 2 comments

This is the DeamonD weapon view and world model version for Opposing Force. See description for details.

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Half-Life: Opposing Force
Platforms
Windows
Developer
Gearbox Software
Engine
GoldSource
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