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

21 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: Opposing Force SP Map fixes patch
Half-Life: Opposing Force

Half-Life: Opposing Force SP Map fixes patch

Dec 14, 2014 Half-Life: Opposing Force Patch 2 comments

Contains bug fixes for various map for Half-Life: Opposing Force - single player. To note that the structure of the maps isn't changed at all , only entities...

IWM
Half-Life: Opposing Force

IWM

Oct 21, 2014 Improvement weapons models Full Version 0 comments

Full version. Improvement weapons models for Opposing Force. Full version. Improvement weapons models for Opposing Force. Full version. Improvement weapons...

Sledge Alpha Build
Half-Life

Sledge Alpha Build

Aug 19, 2014 Half-Life Mapping Tool 3 comments

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.

Post comment Comments  (0 - 10 of 66)
Col_Jason
Col_Jason Jul 29 2014, 10:38am says:

lol I love the boot camp, It's so cool.

+2 votes     reply to comment
EDOC_32
EDOC_32 Jan 15 2014, 6:09pm says:

Why Op4 is a "Game", if he is a mod for HL?, i not understand ^^

-2 votes     reply to comment
Elitesse
Elitesse Mar 29 2014, 12:03pm replied:

Valve called Gearbox and asked them to make an Expansion Pack for Half-Life, it's not a mod. Same thing for Blue-Shift, but it was originally designed to be an add-on for the cancelled Dreamcast version of Half-Life.

+4 votes     reply to comment
ShouldBeNew
ShouldBeNew Feb 20 2014, 8:29am replied:

It used to be a Half-Life mod but then Valve decided to make it a game/expansion.

-2 votes     reply to comment
Elitesse
Elitesse May 9 2014, 3:52pm replied:

No. It wasn't a mod. Read the wikipedia page of the game!

+1 vote     reply to comment
Goat‪
Goat‪ Dec 29 2013, 7:22am says:

It doesn't make sense how they replaced the SMG MP5 with a AR M4 in the Hi-Res update pack.

+2 votes     reply to comment
Elitesse
Elitesse Jan 2 2014, 7:32am replied:

The M4 was the old machinegun, Valve then switched to the MP5 but Gearbox replaced it with an M4 in the High Definition Pack.

+1 vote     reply to comment
JrComissarValvatorez
JrComissarValvatorez May 5 2013, 6:51pm says:

Valve updates Opposing Force, doesn't tell you about it or the fact that you have to reinstall the game so your not stuck with the ****** HD models.

+4 votes     reply to comment
cola27
cola27 Oct 3 2012, 7:10am says:

is there a way to just download the map?.

i wanna try to edit something new, & at sametime trying to learn how things work

+3 votes     reply to comment
raffy154
raffy154 Sep 26 2012, 5:42am says:

I wonder what happened to Half Life Opposing Force Assault mod o.O

+3 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

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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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