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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Help needed

Help needed

News 5 comments

Map developers needed.

RTSL Awards 2016

RTSL Awards 2016

News

Later, way later than I had hoped, but here are the full details of the RTSL Awards 2016.

J.A.C.K. 1.1.1212 Available in Steam Store

J.A.C.K. 1.1.1212 Available in Steam Store

News 30 comments

J.A.C.K. (previously known as Jackhammer) is a brand new level editor for games with a quake-style BSP architecture (Half-Life, Quake, Hexen II, Quake...

Military Duty release V1.0 final

Military Duty release V1.0 final

Half-Life Opposing Force Fans 5 comments

A mod update for a Half-Life Opposing Force Single Player adventure. (standalone) Make sure to check it out.

Opposing Force Assault 2015 recap and future plans
Half-Life

Opposing Force Assault 2015 recap and future plans

Opposing Force Assault 1 comment

2015 Recap, Demo feedback, updates, 2016+ plans.

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 34 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
Half-Life

Alpha Demo available

Opposing Force Assault 10 comments

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

Military Duty - Mod Release
Half-Life: Opposing Force

Military Duty - Mod Release

Military Duty 13 comments

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

Project announcement
Half-Life: Opposing Force

Project announcement

Hl Opposing Force - Firestorm 8 comments

Today I'm announcing a smaller side project of mine. One I've been working on for quite some time now but just recently have I made massive breakthroughs...

2014 Kickoff Update

2014 Kickoff Update

News 31 comments

The latest news on Operation Black Mesa and Guard Duty!

Half-Life: Echoes Announcement

Half-Life: Echoes Announcement

News 27 comments

After 15 years of enjoying Half-Life, and the endless user-created content over those years, I wish to give back to the community and create my own take...

Lifesign detected
Half-Life: Opposing Force

Lifesign detected

Hl Opposing Force - Firestorm 4 comments

I've returned once again. Several improvements have been made over the year.

The June Break
Half-Life: Opposing Force

The June Break

Soldier's Adventures 4 comments

Due to exams, we can not work yet fully operational. Work will resume in early July.

Sitrep = Situation Report
Half-Life: Opposing Force

Sitrep = Situation Report

Hl Opposing Force - Firestorm 12 comments

Today I have great news to tell. New models and maps are coming great along.

Welcome back in the Field Soldier!
Half-Life: Opposing Force

Welcome back in the Field Soldier!

Hl Opposing Force - Firestorm 6 comments

Well I'm back people like promised fresh and with many news to tell you. Read the entire news if you want to know more about my mod and it's current status...

We are looking for a coder.
Half-Life: Opposing Force

We are looking for a coder.

Hl Opposing Force - Firestorm 17 comments

We need help! Read the entire news to learn more about the latest progress and why we needing you....

Newstime
Half-Life: Opposing Force

Newstime

Hl Opposing Force - Firestorm 10 comments

We're still building on the mod. Learn more about the latest progress when you read the entire news...

Status report
Half-Life: Opposing Force

Status report

Hl Opposing Force - Firestorm 11 comments

I'm still building on the mod. Learn more about the latest progress when you read the entire news...

New Team members and an update
Half-Life: Opposing Force

New Team members and an update

Hl Opposing Force - Firestorm 7 comments

Hey folks! Today is a great day for my mod. Welcome with me together some new team members and see a picture update.

Update
Half-Life: Opposing Force

Update

Hl Opposing Force - Firestorm 4 comments

See some new pictures of my WIP stuff and enjoy. I'm Still working hard on the mod.

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