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.

Added | Game Name | Type | Licence
2bases - OP4CTF and TFC
Game

2bases - OP4CTF and TFC

Sep 5, 2011 Multiplayer Map proprietary licence (3.25mb) 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
Game

2bases 1.3

Apr 5, 2014 Multiplayer Map gpl licence (1.78mb) 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...

Beta Zombie Recreation
Half-Life

Beta Zombie Recreation

Nov 6, 2013 Half-Life Animal Model proprietary licence (0.25mb) 0 comments

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

CenBlas - HL1OF
Game

CenBlas - HL1OF

Apr 29, 2013 Language Sounds public domain licence (0.12mb) 0 comments

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

cs_trepidation
Half-Life

cs_trepidation

Aug 10, 2010 Half-Life Multiplayer Map proprietary licence (16.89mb) 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...

Floating City OP4 Edition *EXPANDED EDITION*
Game

Floating City OP4 Edition *EXPANDED EDITION*

Mar 30, 2014 Multiplayer Map creative commons licence (0.21mb) 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
Counter-Strike

Gold Source Anthology Add On Content Pack

Aug 2, 2014 Counter-Strike Multiplayer Map proprietary licence (1,503.68mb) 0 comments

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

Gonome
Game

Gonome

Aug 10, 2012 Animal Model proprietary licence (0.80mb) 3 comments

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

Half-Life Collection Golden Definition Pack
Half-Life

Half-Life Collection Golden Definition Pack

Sep 5, 2013 Half-Life Models Pack proprietary licence (398.54mb) 17 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

Half-Life: Further Data + dm_office

Feb 22, 2015 Half-Life Multiplayer Map proprietary licence (5.00mb) 5 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 and healt charger from half life decay
Half-Life

Hev charger and healt charger from half life decay

Sep 14, 2014 Half-Life Prop Model public domain licence (0.09mb) 7 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...

Later Alpha MP5 Replica
Half-Life

Later Alpha MP5 Replica

Nov 4, 2013 Half-Life Weapons Model proprietary licence (0.04mb) 2 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
Game

Mechanized Death: Army of None

Jul 24, 2014 Singleplayer Map proprietary licence (2.19mb) 0 comments

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
Game

Mission Impossible

Jul 24, 2014 Singleplayer Map proprietary licence (2.55mb) 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...

My first Opposing Force map!
Game

My first Opposing Force map!

Feb 19, 2011 Multiplayer Map proprietary licence (0.32mb) 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...

My OpposingForce maps
Half-Life: Opposing Force

My OpposingForce maps

Feb 6, 2013 OpposingForce :Cartoon CTF Multiplayer Map proprietary licence (25.75mb) 2 comments

My map made in my little pony´╝č Map content theme for the Astor Empire, a mysterious empire. German Empire split after independence. Astor kingdom, Pony...

New Geneworm
Game

New Geneworm

Jul 26, 2011 Animal Skin proprietary licence (1.10mb) 9 comments

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

New Massn
Half-Life

New Massn

Nov 11, 2012 Sven Co-op Players Model creative commons licence (5.65mb) 2 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...

OP4 CartoonMappack
Half-Life: Opposing Force

OP4 CartoonMappack

Feb 6, 2013 OpposingForce :Cartoon CTF Multiplayer Map proprietary licence (25.75mb) 0 comments

Map content theme for the Astor Empire, a mysterious empire. German Empire split after independence. Astor kingdom, Pony kingdom.

OP4 DeamonD Pack
Game

OP4 DeamonD Pack

Jan 29, 2015 Models Pack proprietary licence (10.37mb) 1 comment

This is the DeamonD version for Opposing Force. See description for details.

Operation Sandblast
Game

Operation Sandblast

Dec 19, 2013 Singleplayer Map proprietary licence (0.80mb) 2 comments

The creator goes by the same name here on moddb. This map was made immediately after completing Rumble, for the Best Train Ride Contest at the Valve ERC...

OpposingForceMaps
Game

OpposingForceMaps

Apr 9, 2014 Singleplayer Map proprietary licence (5.09mb) 0 comments

OpposingForceMaps: Ivy, Friendly Fire, Battle, Firing Range, Scientist Rescue, J2000, Little Escape, Underhalls, You Die, Postal, Sandblast, Zombies...

OpposingForceMaps2
Game

OpposingForceMaps2

Apr 9, 2014 Singleplayer Map proprietary licence (112.43mb) 0 comments

Black Bag Operations, Fallen Chaper, Bomb Squad, Corruption, Ep_rst1, Ground Zero, Ground Zero 2, Klabautermann, Mission Impossible, Red Area, Without...

OpposingForceMaps3
Game

OpposingForceMaps3

Apr 13, 2014 Singleplayer Map proprietary licence (37.33mb) 0 comments

Without Doubts, Snowy Rock, Fallback (Peter Lok), Aliens, Warzone, Foothold, Mechanized Death: An Army of None.

Paul Blart Mall Cop reskin for Otis
Game

Paul Blart Mall Cop reskin for Otis

May 28, 2015 Animal Model proprietary licence (0.26mb) 0 comments

Have you ever wanted to fight alongside Paul Blart in Black Mesa? Me neither. But here it is.

Player Model Disguise 1.0
Half-Life: Opposing Force

Player Model Disguise 1.0

Jul 7, 2013 THE PLAYER MODELS Players Skin proprietary licence (6.93mb) 1 comment

Download Version 1.0 of Player Model Disguise. This version has 32 models.

Player Model Disguise 1.0.1
Half-Life: Opposing Force

Player Model Disguise 1.0.1

Jul 21, 2013 THE PLAYER MODELS Players Model proprietary licence (7.55mb) 0 comments

This is a small update for the Civilian. It adds 3D glasses and blood. This is the first update that is for a model.

Prefabs Pack
Counter-Strike

Prefabs Pack

Dec 30, 2013 Counter-Strike Prefabs proprietary licence (4.88mb) 2 comments

A large zip file containing all prefabs downloaded from the Prefab Lab (the site has been shut down in 05-10-2002) since 5/1/1999. This pack contains...

Small Models Pack
Half-Life

Small Models Pack

Feb 25, 2012 Half-Life: Particle Fusion Models Pack proprietary licence (0.10mb) 4 comments

This updates the corresponding ammoboxes that they are named. This also comes with a whole new model.

Snow Rock
Game

Snow Rock

Jul 24, 2014 Singleplayer Map proprietary licence (5.09mb) 0 comments

Snow Rock Part 1 is a total of 7 maps made by a veteran russian mapper. Extract all files in your Gearbox mainfolder. (half-life/gearbox/) Start Opposing...

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Half-Life: Opposing Force
Platform
Windows
Developer
Gearbox Software
Engine
GoldSource
Contact
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Release Date
Released Oct 1999
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Addon Statistics
Files
38
Size
2.42gb
Downloads
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Addon Categories
 - Multiplayer Map
10
 - Singleplayer Map
9
 - Prefabs
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 - Animal Model
4
 - Players Model
2
 - Prop Model
1
 - Weapons Model
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