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

19 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
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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...

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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...

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

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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...

Post comment Comments  (10 - 20 of 66)
predator101
predator101 May 18 2012, 10:44am buried:

(buried)

I can't download opposing forse!!!!!!!

-6 votes     reply to comment
Elitesse
Elitesse Oct 1 2013, 9:49am replied:

Use piratebay

+5 votes     reply to comment
Guest
Guest Mar 5 2013, 3:07am replied:

You can buy it and download it on Steam.com for $4.99.

+5 votes     reply to comment
ThatMercenarySnake
ThatMercenarySnake May 9 2012, 8:45pm says:

too bad valve is making sand-whiches with it's idea of a "3D" half life 1

+1 vote     reply to comment
Goat‪
Goat‪ May 6 2012, 11:02pm says:

I prefered this expansion more than the base game, lol.

+8 votes     reply to comment
ShadowFear
ShadowFear Apr 11 2012, 7:53pm says:

I found the Opposing Force CD yesterday. I put it in the cd player for my car and there's absolutely nothing like driving around to this song.

Youtu.be It just screams "KILL!"

+4 votes     reply to comment
Dr.Goupyl
Dr.Goupyl Dec 23 2011, 5:33am says:

The best expansion ever made.

+3 votes     reply to comment
Garyn Dakari
Garyn Dakari Oct 1 2011, 6:41am says:

Just finished HL1, HL:OF, and HL:BS.

HL was near perfect in my mind, 10/10 all the way.

OF added some fun new weapons and gameplay mechanics, but almost nothing to the story. And the main character and villain just seemed to be copies of the ones from HL. I liked that one boss fight though, where you had to turn on the Gearbox, activate the Steam vents, and turn the Valve to kill the beast :P 8/10

BS didn't add any new gameplay or weapons, which was slightly annoying, but it made sense. It cleared up a few things about the story which was good, and the Gordan cameos were pretty funny. It was also really short and REALLY easy. I didn't ever die against an enemy in the whole game, and it only took 2 hours to play. And, without spoiling anything, I thought the ending was kinda lame. I'd give it a 7/10

All in all, I loved HL, and liked the expansions. I'll call HL a "Must play" and recommend the expansions if you like HL.

Haven't played HL2 yet, so no rating on that ;)

+2 votes     reply to comment
E3Pointman
E3Pointman Apr 18 2011, 6:03pm says:

I love this Game , i just love it!!!!Ahhh good memories :P

+1 vote     reply to comment
Cheeezy
Cheeezy Oct 29 2011, 9:06pm replied:

They cannot do it for HL2 or Gmod because that is on the source engine and that would be porting and if they did port it it would be illegal and it wouldn't work. For opposing force you do not need to download anyhting just when your in the main menu open the console and type "sv-cheats 1" without the quotes and load a level and then open the console again and type "give item_longjump" without the quotes. it will automaticaly give you hl1's longjump and you can use it.

-1 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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First Person Shooter
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Sci-Fi
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Single Player
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AAA
Expansion Pack
This game is an expansion for Half-Life
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Half-Life: Decay, Released Nov 14, 2001
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Half-Life: Blue Shift, Released Jun 11, 2001
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