Half-Life: Opposing Force on Steam - User reviews, Price & Information

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Return to the Black Mesa Research Facility as one of the military specialists assigned to eliminate Gordon Freeman. Experience an entirely new episode of single player action. Meet fierce alien opponents, and experiment with new weaponry. Named 'Game of the Year' by the Academy of Interactive Arts and Sciences.

Half-Life: Opposing Force is a fps, action and classic game developed by Gearbox Software and published by Valve.
Released on November 01st 1999 is available on Windows, MacOS and Linux in 4 languages: English, French, German and Korean.

It has received 25,561 reviews of which 24,363 were positive and 1,198 were negative resulting in an impressive rating of 9.3 out of 10. 😍

The game is currently priced at 4.99€ on Steam.

The Steam community has classified Half-Life: Opposing Force into these genres:

FPS Action Classic Sci-fi Singleplayer Shooter First-Person Aliens 1990's Adventure Military Atmospheric Story Rich Silent Protagonist Great Soundtrack Gore Puzzle Moddable Retro Co-op

Media & Screenshots

Get an in-depth look at Half-Life: Opposing Force through various videos and screenshots.

Half-Life: Opposing Force screenshot
Half-Life: Opposing Force screenshot
Half-Life: Opposing Force screenshot
Half-Life: Opposing Force screenshot
Half-Life: Opposing Force screenshot

System requirements

These are the minimum specifications needed to play the game. For the best experience, we recommend that you verify them.

Windows

Minimum: 500 mhz processor, 96mb ram, 16mb video card, Windows XP, Mouse, Keyboard, Internet Connection

Recommended: 800 mhz processor, 128mb ram, 32mb+ video card, Windows XP, Mouse, Keyboard, Internet Connection

MacOS
Minimum: OS X Snow Leopard 10.6.3, 1GB RAM, 4GB Hard Drive Space,NVIDIA GeForce 8 or higher, ATI X1600 or higher, or Intel HD 3000 or higher Mouse, Keyboard, Internet Connection
Linux
Minimum: Linux Ubuntu 12.04, Dual-core from Intel or AMD at 2.8 GHz, 1GB Memory, nVidia GeForce 8600/9600GT, ATI/AMD Radeaon HD2600/3600 (Graphic Drivers: nVidia 310, AMD 12.11), OpenGL 2.1, 4GB Hard Drive Space, OpenAL Compatible Sound Card

User reviews & Ratings

Explore reviews from Steam users sharing their experiences and what they love about the game.

July 2025
We never got to find Morgan Freeman, which really sucks because he is one of my favourite actors. Still a good game tho.
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July 2025
Half-Life: Opposing Force. Man, what a wild ride. Gearbox dropped this thing back in ‘99, and honestly, it wasn’t just tacked-on DLC or whatever. They actually put in the work. Instead of making you run through the same old Black Mesa halls as Gordon again, Opposing Force flips the whole script, you’re Adrian Shephard this time, a Marine tossed into the blender to “contain” the disaster. Spoiler: it goes off the rails immediately. Alien monsters everywhere, scientists losing their minds, your own squad turning on you, basically a military op gone completely sideways. The gutsiest move? You’re playing as the folks who used to be the bad guys. Remember hating those grunts in Half-Life? Yeah, now you are one. It’s genius, honestly. Suddenly, the lines get blurry. You end up feeling kinda bad for Shephard and his crew, dudes just trying to survive, getting chewed up by the same nightmare as everyone else. Everything’s confusing and messy, which makes the story way more interesting than some basic good guy vs. bad guy setup. Plus, that ending? Still gets people arguing on forums decades later. The storytelling is top-notch, too. No cutscenes yanking you out of the action. Stuff just happens around you, explosions, freaky alien stuff, soldiers panicking. You catch glimpses of places you remember from the first game, but now they hit different because you’re seeing them from another angle. There’s this whole vibe of being abandoned and lied to, which, yeah, feels pretty relevant. Gameplay-wise, Opposing Force goes hard. New enemies? Tons. Some are just jacked-up versions of old aliens, others are brand-new freaks. And the weapons, oh man, forget just crowbars and shotguns. You get all kinds of ridiculous tools, including some weird alien gadgets and even a grappling hook made out of a barnacle. Yes, a barnacle. It’s as gross as it sounds, but it’s awesome for climbing around. And you can tell your squadmates what to do now, sending a medic to patch you up or an engineer to bust open a door. Adds a bit of strategy that wasn’t there before. Level design? Still tight. You’re crawling through gross sewers one minute, dodging death lasers in abandoned labs the next. Gearbox kept things moving, so you’re never stuck doing the same thing for too long. The game leans more into combat than the original, but it never loses that spooky, “something’s-watching-me” atmosphere. Seriously, some sections will have you sweating bullets. Okay, sure, the graphics are old-school, GoldSrc engine and all that, so don’t expect it to blow your mind visually. But honestly, the art direction still slaps. Plus, if you grab one of those updated versions with the High Definition Pack, it looks way sharper. Sound’s still killer, too. Creepy music, punchy gunfights, all that good stuff. What really makes Opposing Force stand out, though, is how it fits into the Half-Life world. It doesn’t just rehash the original or feel like someone’s fanfic. It fills in gaps, gives you a whole new take on the disaster, and actually makes the universe richer. Tons of people still call it one of the best expansion packs ever made, and I’m not arguing. Opposing Force is way more than a side story. It’s a beast of a game on its own, fresh ideas, deeper gameplay, and a story that sticks with you. If you love Half-Life and somehow missed this one, fix that. It’s not just a worthy follow-up; it’s a legend.
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March 2025
> be me > grunt in HECU, get deployed to Black Mesa > told it's cleanup duty, ez clap > aliens start phasing in from freaky hell dimension > scientists throwing wrenches at me > get eaten by sentient barnacle on the ceiling > somehow still alive > find a wrench, become the janitor of fate > see things no paycheck can justify > no one gets paid, no one gets out > 10/10 would get PTSD again > play Opposing Force > it's like Half-Life, but with more *oof* and less Freeman > recommend it, poor soldiers didn’t get paid enough for this > classic expansion, aged like irradiated wine 🦀 Shephard still MIA 🦀
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Nov. 2024
Best Half Life DLC of the many. Extremely good Combat and Problem Solving Mechanics, and pays great respect to the environments of Half Life 1. Thank You Valve for releasing this masterpiece Adrian Shepard is literally me now.
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Nov. 2024
This official Half-Life mod is even more unique to the original game than the other mod, Blue Shift. Opposing Force was released first, it feels more fleshed out, lasts longer than Blue Shift, has new weapons, new enemies, but it's still shorter than the original Half-Life. All Half-Life fans should take the time to experience this alternative part of the Half-Life story, and allow themselves to see the Black Mesa incident from the eyes of someone in the military, an enemy of Gordon Freeman from the original. Both this and the other mod seem to be only considered semi-canonical by valve, as I've heard that (paraphrasing) "only the parts of these mods that are directly mentioned by later entries is canon." Absolutely worth playing despite not being a mainline game, I would highly recommend this before jumping into Half-Life 2, although playing that game first would be fine as well, I suppose.
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Frequently Asked Questions

Half-Life: Opposing Force is currently priced at 4.99€ on Steam.

Half-Life: Opposing Force is currently not on sale. You can purchase it for 4.99€ on Steam.

Half-Life: Opposing Force received 24,363 positive votes out of a total of 25,561 achieving an impressive rating of 9.32.
😍

Half-Life: Opposing Force was developed by Gearbox Software and published by Valve.

Half-Life: Opposing Force is playable and fully supported on Windows.

Half-Life: Opposing Force is playable and fully supported on MacOS.

Half-Life: Opposing Force is playable and fully supported on Linux.

Half-Life: Opposing Force offers both single-player and multi-player modes.

Half-Life: Opposing Force offers both Co-op and PvP modes.

Half-Life: Opposing Force does not currently offer any DLC.

Half-Life: Opposing Force does not support mods via Steam Workshop.

Half-Life: Opposing Force does not support Steam Remote Play.

Half-Life: Opposing Force is enabled for Steam Family Sharing. This means you can share the game with authorized users from your Steam Library, allowing them to play it on their own accounts. For more details on how the feature works, you can read the original Steam Family Sharing announcement or visit the Steam Family Sharing user guide and FAQ page.

You can find solutions or submit a support ticket by visiting the Steam Support page for Half-Life: Opposing Force.

Data sources

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Additionally, we incorporate data from the SteamSpy API, which offers insights into game sales and player statistics. This helps us present a comprehensive view of each game's popularity and performance within the gaming community.

Last Updates
Steam data 12 September 2025 22:13
SteamSpy data 10 September 2025 02:22
Steam price 13 September 2025 20:45
Steam reviews 12 September 2025 15:53

If you'd like to dive deeper into the details about Half-Life: Opposing Force, we invite you to check out a few dedicated websites that offer extensive information and insights. These platforms provide valuable data, analysis, and user-generated reports to enhance your understanding of the game and its performance.

  • SteamDB - A comprehensive database of everything on Steam about Half-Life: Opposing Force
  • SteamCharts - Analysis of Half-Life: Opposing Force concurrent players on Steam
  • ProtonDB - Crowdsourced reports on Linux and Steam Deck Half-Life: Opposing Force compatibility
Half-Life: Opposing Force
4.99€ Visit Store
Rating
9.3
24,363
1,198
Game modes
Features
Online players
83
Developer
Gearbox Software
Publisher
Valve
Release 01 Nov 1999
Platforms
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