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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Opposing Force Boot Camp and We Are Pulling Out Boot Camp and We Are Pulling Out
Blog RSS Feed Report abuse Latest News: 2014 Kickoff Update

16 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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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...

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Half-Life Unofficial FAQ

May 9, 2014 Half-Life Other 0 comments

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

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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...

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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...

Shepard's Adventures
Half-Life: Opposing Force

Shepard's Adventures

Mar 31, 2013 Shepard's Adventures Full Version 0 comments

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...

Post comment Comments  (20 - 30 of 66)
AmaroqDricaldari
AmaroqDricaldari Apr 10 2011, 9:28am says:

I want someone to make the LongJump Module useable in Half-Life 2, GMod, and Half-LIfe Opposing Force. I am starting to get annoyed that nobody has done that yet.

+1 vote     reply to comment
RangerC
RangerC Mar 19 2011, 7:23am says:

OP4 + Joebama's server = maximum WIN

+4 votes     reply to comment
sasasa
sasasa Dec 27 2010, 9:01am says:

anyone interested in making new/ high quality drill instructor, 9mm, 9mmAR,.. And all of the others?
don't mention about the redux
oh, and HD map textures???

+1 vote     reply to comment
JrComissarValvatorez
JrComissarValvatorez Dec 30 2010, 8:07am replied:

Right now I'm just crossing my fingers and hoping Opposing Force is the next thing Richard does after Half Life for his Ultra definition packs.

+1 vote     reply to comment
JrComissarValvatorez
JrComissarValvatorez Nov 10 2010, 8:37am says:

Some up to date models packs would be most appreciated, I haven't been able to find decent replacements for the M249 Saw and the Sniper Rifle and am now using conversions from CS:S with crappy low resolution textures.

+1 vote     reply to comment
JrComissarValvatorez
JrComissarValvatorez Nov 13 2010, 11:28pm replied:

Found a decent M249 converted from Condition Zero even though it's compiled for Sven Coop, still looking around for a decent M24 for sniper rifle though.

+1 vote     reply to comment
[OTC]SMOKEY
[OTC]SMOKEY Nov 9 2010, 1:04am says:

As long as u dont scrap the project, I dont really feel betrayed. Meaning that this and any other op4 mods progress, for me, is anxiously anticipated. Thanks for the update

+1 vote     reply to comment
$$$killer$$$
$$$killer$$$ Oct 19 2010, 6:22pm says:

buy hl from 9,99 dollars and opposing force 4,99 dollars

+1 vote     reply to comment
GeneralElite
GeneralElite Sep 4 2010, 12:49pm says:

Could You Try To Make A Bot System?

+1 vote     reply to comment
tschumann
tschumann Sep 27 2010, 10:09pm replied:

You mean multiplayer bots? HPB bot supports Opposing Force.

+1 vote     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

234 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

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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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