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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Gargantua Dam Poor Scientist Opposing Force
Blog RSS Feed Report abuse Latest News: 2014 Kickoff Update

18 comments by Uphys on Mar 29th, 2014

Welcome to our first media update this year!

Read Full Article.

Multiplayer Beta Release Q1 2014 Cancelled


Our plan to bring you the multiplayer beta of Operation Black Mesa early this year didn't work out, regrettably. Several factors and circumstances forced us to completely keep it under the hood until further notice.
Read more...

Multiplayer Progress


Multiplayer will feature classic maps such as Yard, Crossfire and Boot Camp as well as brand-new ones like Deptcharge and Gambit from day 1.
Currently in development: CTF mode and weapon placement.

Depthcharge

Singleplayer Campaign


Development is running smoothly; those NPCs aren't going to animate themselves though! If you're interested in joining our team, check out the jobs page where you can find all positions currently open. We look forward to welcoming you on board!

Pit Worm's Nest

Remember Guard Duty (Blue Shift: Source)? We're making solid progress here too:

Living Quarters Outbound

OBM: The Video Game?


We've been given the option of developing our projects as full indie titles to be sold on Steam!
This opens up a whole lot of attractive possibilities to consider; however no decision has been reached yet as to this matter.
Read more...

Alien Controller

M1A1 Tank

Thanks for your support in making all of this possible!

Until next time,
Tripmine Dev Team

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Sledge Alpha Build
Half-Life

Sledge Alpha Build

Aug 19, 2014 Half-Life Mapping Tool 1 comment

Sledge is a completely free and open-source replacement for Valve's Hammer Editor, with a focus on compatibility with both Goldsource and Source engines...

Half-Life Dreamcast Strategy Guide
Half-Life

Half-Life Dreamcast Strategy Guide

Jul 3, 2014 Half-Life Guides 2 comments

A Strategy Guide for the Half-Life Dreamcast version was written but never released. I have updated it on Moddb because it's not sold anywhere! It can...

Half-Life Uplink
Half-Life

Half-Life Uplink

Jun 16, 2014 Half-Life Demo 4 comments

This is one of the two demos released for Half-Life. The first one, called Day One, was just shipped with certain video cards and never released to the...

Half-Life Unofficial FAQ
Half-Life

Half-Life Unofficial FAQ

May 9, 2014 Half-Life Other 0 comments

I have found this Unofficial FAQ on an archived Half-Life website.

Gearcraft
Half-Life

Gearcraft

Apr 22, 2014 Half-Life SDK 0 comments

Gearcraft is the level editor designed for use with Nightfire, and as such is better suited to level development than the older Hammer 3.5 ie it works...

Further-Data
Half-Life

Further-Data

Apr 1, 2014 Half-Life Patch 3 comments

This is Further-Data, a small bonus CD released for free in 1999 via retail channels to Half-Life players. It contains bonus audio and music, lots of...

Post comment Comments  (40 - 50 of 67)
Riker7
Riker7 Mar 26 2010, 3:14pm says:

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

+1 vote     reply to comment
JrComissarValvatorez
JrComissarValvatorez May 18 2010, 1:00am replied:

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

+1 vote     reply to comment
Headshot_
Headshot_ Feb 12 2010, 5:21pm says:

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

+2 votes     reply to comment
REENIGAV
REENIGAV Nov 27 2009, 2:11pm says:

half life opposing force is one of the best half life

+4 votes     reply to comment
callea
callea Oct 31 2009, 7:52am says:

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

-2 votes     reply to comment
ytres
ytres Mar 9 2010, 9:04pm replied:

operation black mesa, coming eventually.

+2 votes     reply to comment
m82sniper
m82sniper Nov 18 2009, 2:33pm replied:

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

+3 votes     reply to comment
ytres
ytres Jul 17 2010, 6:59am replied:

Go buy it on steam.

+1 vote     reply to comment
ytres
ytres Mar 9 2010, 9:06pm replied:

yep opposing force, blue shift, counterstrike, day of defeat, ricochet, are all mods of half-life. even if you can buy cs or dod on steam without half life, they are mods of half life because they run off of hl.exe

+1 vote     reply to comment
Thanoshld
Thanoshld Feb 6 2010, 3:19pm replied:

An expansion to be correct.Along with Blue Shift.

+2 votes     reply to comment
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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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9.5

236 votes submitted.

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Highest Rated (4 agree) 10/10

The campaign is almost as good as HL's but the multiplayer is just the icing on the cake, Oh but the the cake is lie... oh well.

Nov 21 2010, 10:17am by X-LAyer2

Style
Genre
First Person Shooter
Theme
Sci-Fi
Players
Single Player
Project
AAA
Expansion Pack
This game is an expansion for Half-Life
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More Expansions
Half-Life: Decay, Released Nov 14, 2001
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Half-Life: Blue Shift, Released Jun 11, 2001
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Half-Life: Opposing Force
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