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Half-Life: Opposing Force
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 a
What players say
Steam review score and the most-helpful voices, which may include critical ones. Data as of 2026-05-20.
What reviewers agree on
32 of the 103 reviews raise this.
“Between the two expansions this is very obviously the superior one. Blue Shift is great don't get me wrong, but this is just on another level. New enemies, weapons, and game mechanics add such a refreshing change to the…”
“It definitely peaks in the first half but you can still enjoy the second half if you turn on God mode and start roleplaying as a revived Aztec warrior shanking random black ops soldiers. 9/10”
“Стим меня заставляет чет написать, поэтому скажу так, аддон для первой халфы достаточно прикольный, раскрывает старый движок с неожиданных сторон, но это больше достижение мапперов Gearbox в умении придумывать всякие…”
15 of the 103 reviews raise this.
“This game is a wonderful addition to the Half Life series. Seeing the events of the Resonance Cascade happen from the HECU’s pov is simply wonderful. Cpl. Adrian Shepard is a badass through and through. This game is a…”
“Half-Life: Opposing Force, is one of those expansions that had no right going this hard. You’re not Gordon this time, you’re one of the soldiers sent to clean up the mess, and it flips the whole thing in a really cool…”
“Yeah, worth a play through to see the story from the HECU perspective. I didn't think it was as great has the base game (hard push, really), but it's certainly a worthwhile expansion pack to play through and more than…”
5 of the 103 reviews raise this.
“WHY IS THIS SO FREAKING LONG ITS FIRE!!!!!!!!!!”
“Pretty good, feels solid, feels a good length, by the time I hit the end I was about over it so it was right on time. guns feel good, new enemies are challenging and most of the set pieces are decent. I will add that…”
“More good old Half-Life. While not as polished and impactful as the original, it's still a very solid experience for an afternoon of nostalgia (can be beaten in ~4h).”
10 of the 103 reviews raise this · 10 of them still recommend the game.
“Pretty good expansion. Nice levels, some new weapons and enemies. They even made their own tutorial bootcamp, which is quite humorous with all the berating from sergeants. Some bugs have crept in, unfortunately. I got…”
“This was quite a good DLC. In gameplay terms it plays out pretty much the same as the base game. You just get to see things from the perspective of the soldiers. There's a few annoying enemies here and it gets tough in…”
“This game is a wonderful addition to the Half Life series. Seeing the events of the Resonance Cascade happen from the HECU’s pov is simply wonderful. Cpl. Adrian Shepard is a badass through and through. This game is a…”
3 of the 103 reviews raise this · 3 of them still recommend the game.
“Pretty good expansion. Nice levels, some new weapons and enemies. They even made their own tutorial bootcamp, which is quite humorous with all the berating from sergeants. Some bugs have crept in, unfortunately. I got…”
“This expansion still holds up, despite some abnormal difficulty spikes and the annoying ass bugged elevators. More games need expansions like this, and the only other title that I can think of right now that does the…”
“This expansion took me about 7 hours to finish and I really like the cool stuff it does. I especially like the alien weapons like the Barnacle, the pea shooter, and the electric ant. The sniper, machine gun, and deagle…”
3 of the 103 reviews raise this · 3 of them still recommend the game.
“This was quite a good DLC. In gameplay terms it plays out pretty much the same as the base game. You just get to see things from the perspective of the soldiers. There's a few annoying enemies here and it gets tough in…”
“Well, it's more Half-Life. I'm probably in the minority to say I preferred Blue Shift over Opposing Force, but that is how I feel with this one. It's not a bad game in my opinion and it's a worthy play for any…”
“A bit of a disappointing expansion pack for me. First of all, you play as the antagonist faction from the original [i]Half-Life[/i] but with none of the villainous aspects. The differing perspective only serves to pay…”
Counted across 103 English reviews, sampled to match this game's 95.3% positive rating · as of 2026-05-20
“An excellent addition to the HL story, told from Corporal Shepard's perspective. It explained a lot and revealed what was going on behind the scenes of the first game.”
— a player, Steam review · 6 hrs played“A Worthy expansion for the Half-Life game. It does exactly what its supposed to do, It adds a ton of new and interesting content that expands the scope of the original Half-Life 1998 game by adding new weapons, enemies, boss fights, a squad system (sort of) and much much more.…”
— a player, Steam review · 16 hrs played“A fantastic DLC to a fantastic game. It pumps up the tempo. It's pretty short but packed to the brim with action. It adds new weapons and enemies and makes you fight larger threats overall. At times it feels more like doom than half life in my opinion, though that's not really…”
— a player, Steam review · 4 hrs playedPlayer activity
Monthly average concurrent players. Live count fetched 2026-07-11 11:37 UTC · history via SteamCharts.
Price tracking
US-region pricing (USD), sampled twice daily by our own tracker since 2026-07-11. Steam prices vary by region — always confirm your local price on Steam.
Regional prices at last sample, in local currency — Steam sets each region's price independently.
Cheapest → most expensive, converted to USD at ECB reference rates (2026-07-24). Relative comparison only.
Latest official news
Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.
Half-Life: Opposing Force update released
An update for Half-Life: Opposing Force is now available: Fixes Fixed end of game transition failing to run after defeating final boss Fixed grapple sound effects and alternate fire Fixed crash when t
Half-Life: Opposing Force update released
A small update for Half-Life: Opposing Force is now available: Engine Fixed bug in skybox image loading Fixed bug in demo command processing Prevent certain path characters from being used in commands
Half-Life: Opposing Force update released
We have updated the public release of Half-Life: Opposing Force. Changes in this update are: Fixed crash when entering certain malformed strings into the game console. Thanks to Marshal Webb from Back
Half-Life: Opposing Force update released
We have updated the public release of Half-Life: Opposing Force. Changes in this update are: Fixed crash when entering certain malformed strings into the game console. Thanks to Marshal Webb from Back
Half-Life: Opposing Force update released
We have updated the public release of Half-Life: Opposing Force. This update contains all the changes from the recent beta, thanks to the whole community for their help with testing and suggesting new
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Screenshots
Official Steam store screenshots — click any shot to enlarge.
Facts & details
From the Steam store record, snapshot 2026-05-20.
| Genres | Action |
| Player tags | FPS · Action · Classic · Sci-fi · Singleplayer · Shooter · First-Person · Aliens · 1990's · Adventure · Military · Atmospheric (SteamSpy community voting) |
| Features | Single-player · Multi-player · Custom Volume Controls · Adjustable Difficulty · Playable without Timed Input · Save Anytime · Valve Anti-Cheat enabled · Family Sharing |
| Languages | English, French, German, Korean |
| Estimated owners | 2,000,000 – 5,000,000 (SteamSpy) |
Minimum system requirements (PC)
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