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.

Half-Life : Residual Power
Half-Life: Opposing Force

Half-Life : Residual Power

2 months ago TBD Single Player Fighting

"Residual Power" is supplementary volume of OP4. Find any item or survivor... When you going to reach the outside, You'll know.

THE PLAYER MODELS
Half-Life: Opposing Force

THE PLAYER MODELS

5 months ago Released Jul 6, 2013 Multiplayer & Co-op First Person Shooter

You're tired of using the same models? Well now no! You can disguise as an enemy now.

Soldier's Adventures
Half-Life: Opposing Force

Soldier's Adventures

7 months ago TBD Single & Multiplayer First Person Shooter

Mod for Opposing Force. The story covers the time from the arrival of soldiers to the nuclear explosion in Black Mesa Research Facility. Contains 27 maps...

Shepard's Adventures
Half-Life: Opposing Force

Shepard's Adventures

1 year ago Released Oct 10, 2011 Single Player First Person Shooter

Hello everybody! Here is my old single player map pack for Opposing Force. This mappack is more of the demo to my unfinished full-scale modification...

OpposingForce :Cartoon CTF
Half-Life: Opposing Force

OpposingForce :Cartoon CTF

1 year ago Released Jan 5, 2013 Single Player First Person Shooter

My map made in my little pony?This is not mod, this is ctfmap Opposing Force ctf map.

Opposing Force Assault
Half-Life: Opposing Force

Opposing Force Assault

2 years ago TBD Single Player First Person Shooter

A half life single player mod witch uses the Opposing Force engine.

Bootleg Squadrog
Half-Life: Opposing Force

Bootleg Squadrog

2 years ago Released Dec 31, 2002 Single Player First Person Shooter

“Bootleg Squadrog, sir. It is not about individualism. It is not about cowboy heroism. It is about being one cohesive unit. The only identity I have is...

Dark Operations
Half-Life: Opposing Force

Dark Operations

2 years ago Released Nov 26, 1999 Single Player First Person Shooter

“It has several puzzles to make it more thinking oriented as well as being full of action. You will traverse and do battle in many different places: labs...

Retaliation
Half-Life: Opposing Force

Retaliation

2 years ago Released May 27, 2000 Single Player First Person Shooter

“Retaliation picks up where Dark Operations left off. There will be no Xen or displacer in Retaliation. Action is the main theme. It will mainly be an...

Little Sky Scraper of Horrors
Half-Life: Opposing Force

Little Sky Scraper of Horrors

2 years ago Released May 15, 2000 Single Player First Person Shooter

The Bad Guys have taken over a building in a Generic American City, and they’ve kidnapped some Innocent Scientists and forced them to genetically engineer...

Super Nova Space Station
Half-Life: Opposing Force

Super Nova Space Station

2 years ago Released Dec 11, 2008 Single Player First Person Shooter

Find a way to escape of the space station, which has suffered some kind of containment breach. - By Xaoc

Double Helix
Half-Life: Opposing Force

Double Helix

2 years ago Released May 26, 2001 Single Player First Person Shooter

YOUR MISSION IS TO INFILTRATE THE BASE OF THE TERRORIST ORGANIZATION KNOWN AS ‘DOUBLE HELIX’.

Foothold
Half-Life: Opposing Force

Foothold

2 years ago Released Feb 7, 2000 Single Player First Person Shooter

“You had just been transferred to this unit. Being in the army was more boring then you had expected. At this new base, they had spent the last 2 days...

Underhalls
Half-Life: Opposing Force

Underhalls

2 years ago Released Feb 25, 2006 Single Player First Person Shooter

A remake of the second map from Doom II for Half-Life Opposing Force. - By D_nawrocki

The Xen Campaigns
Half-Life: Opposing Force

The Xen Campaigns

2 years ago Released Sep 20, 2003 Single Player First Person Shooter

The Xen Campaigns is a single player episode for Half-Life: Opposing Force. Included are 14 maps, some custom sounds, skins and some custom sentences.

Intolerable Threat
Half-Life: Opposing Force

Intolerable Threat

2 years ago Released Aug 9, 2002 Single Player First Person Shooter

Intolerable Threat is a single player map set made for Opposing Force. As Gordon Freeman, you must face down the Administrator for the last time. The...

Ground Zero 2: Fallout
Half-Life: Opposing Force

Ground Zero 2: Fallout

2 years ago Released Jun 15, 2000 Single Player First Person Shooter

Me and you both know what to do now, kill the only witness of our rogue intentions — Gordon Freeman.” the Lieutenant said. “But…how? We have no idea where...

Nuclear Winter
Half-Life: Opposing Force

Nuclear Winter

2 years ago Released Oct 27, 2007 Single Player First Person Shooter

Nuclear Winter is a single player mission for Half-Life Opposing Force. It comprises 29 new maps plus a ton of new scripted scenes, models, artwork, character...

A Soldier's Tale
Half-Life: Opposing Force

A Soldier's Tale

2 years ago Released Aug 30, 2000 Single Player First Person Shooter

A soldier's life is only worth as much as the nation and cause he fights for, his personal beliefs do not matter, only his skill, endurance, bravery and...

Fallback: Fire and Ice
Half-Life: Opposing Force

Fallback: Fire and Ice

2 years ago Released Feb 15, 2000 Single Player First Person Shooter

As Corporal Shepard, you are part of a platoon of marines supplying additional security at Monte del Oscuro (an astronomical research facility). Things...

Under the Black Moon
Half-Life: Opposing Force

Under the Black Moon

2 years ago Released Jun 29, 2002 Single Player First Person Shooter

“You are the Corporal Daniel Shephard, after crash landing on your way to Black Mesa, your brother Adrian became a Corporal in less than 3 years, very...

Half-Life Opposing Force UD Model Pack
Half-Life: Opposing Force

Half-Life Opposing Force UD Model Pack

2 years ago TBD Single & Multiplayer First Person Shooter

Do you remember the 1999 game HL:Opposing Force? Don`t have reasons to play it, well now I will try to reborn OP4 to modern standards: new models, sounds...

Hl Opposing Force - Firestorm
Half-Life: Opposing Force

Hl Opposing Force - Firestorm

2 years ago TBD Single Player First Person Shooter

A half Life1 Opposing Force mod. You're Corporal Shepard. A Soldier which arrives at Black Mesa in an alternate reality. Another Experiment went wrong...

Green Shift
Half-Life: Opposing Force

Green Shift

3 years ago TBD Single Player First Person Shooter

Okay... after Shephard follow Freeman in the planet Xen, a teleporter orb drop Shephard in a another side of Xen (at this point is not too creative i...

Xen Mission
Half-Life: Opposing Force

Xen Mission

4 years ago TBD Single Player First Person Shooter

An episode for Half Life:Opposing Force. We have lost connection with the MXB(Military Xen Base).We will teleport you near the main XEP(Xen to Earth teleport).Your...

Opposing Force Coop
Half-Life: Opposing Force

Opposing Force Coop

5 years ago Released Sep 30, 2007 Single & Multiplayer First Person Shooter

"Half-Life: Opposing Force Coop" allows you to experience the epic Opposing Force story and environment with your friends, or with players around the...

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Half-Life: Opposing Force
Platform
Windows
Developer
Gearbox Software
Engine
GoldSource
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Release Date
Released Oct 30, 1999
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Half-Life Opposing Force UD Model Pack (Half-Life: Opposing Force)
Half-Life Opposing Force UD Model Pack Half-Life: Opposing Force - Single & Multiplayer First Person Shooter
Opposing Force Coop (Half-Life: Opposing Force)
Opposing Force Coop Half-Life: Opposing Force - Single & Multiplayer First Person Shooter
Dark Operations (Half-Life: Opposing Force)
Dark Operations Half-Life: Opposing Force - Single Player First Person Shooter
OpposingForce :Cartoon CTF (Half-Life: Opposing Force)
OpposingForce :Cartoon CTF Half-Life: Opposing Force - Single Player First Person Shooter
Foothold (Half-Life: Opposing Force)
Foothold Half-Life: Opposing Force - Single Player First Person Shooter
Nuclear Winter (Half-Life: Opposing Force)
Nuclear Winter Half-Life: Opposing Force - Single Player First Person Shooter
Little Sky Scraper of Horrors (Half-Life: Opposing Force)
Little Sky Scraper of Horrors Half-Life: Opposing Force - Single Player First Person Shooter
Hl Opposing Force - Firestorm (Half-Life: Opposing Force)
Hl Opposing Force - Firestorm Half-Life: Opposing Force - Single Player First Person Shooter
Under the Black Moon (Half-Life: Opposing Force)
Under the Black Moon Half-Life: Opposing Force - Single Player First Person Shooter
Ground Zero 2: Fallout (Half-Life: Opposing Force)
Ground Zero 2: Fallout Half-Life: Opposing Force - Single Player First Person Shooter
Underhalls (Half-Life: Opposing Force)
Underhalls Half-Life: Opposing Force - Single Player First Person Shooter
Super Nova Space Station (Half-Life: Opposing Force)
Super Nova Space Station Half-Life: Opposing Force - Single Player First Person Shooter
Retaliation (Half-Life: Opposing Force)
Retaliation Half-Life: Opposing Force - Single Player First Person Shooter
Shepard's Adventures (Half-Life: Opposing Force)
Shepard's Adventures Half-Life: Opposing Force - Single Player First Person Shooter