Action · November 1, 1999

Half-Life: Opposing Force (1999)

local_offer-75% current discountgroup1M–10M ownersrecommend23.5k recommendations

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.

Position in Action

Metric	This title	Genre position
Review volume	25.6k Steam reviews	Top 20% in Action
Positive rating	95% positive	Genre average: 83% — this title sits in top 14%
Engagement hours	7 h average	Top 60% for session depth among Action

Peer Action titles

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2023 · 99% · 38.0k

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2023 · 99% · 11.3k

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2024 · 99% · 10.1k

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2019 · 98% · 71.1k · 83/100 MC

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2014 · 98% · 68.3k · 85/100 MC

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Community Tag Signals

Tag weights reflect how many Steam users voted each descriptor — larger pills = stronger consensus.

FPS · 934
Action · 362
Classic · 291
Sci-fi · 285
Singleplayer · 267
Shooter · 251
First-Person · 222
Aliens · 213
1990's · 169
Adventure · 142
Military · 133
Atmospheric · 133
Story Rich · 104
Silent Protagonist · 100
Great Soundtrack · 78

More from Gearbox Software

Gearbox Software has 8 titles indexed — top 6 by review volume below.

Borderlands 3

2020 · 84% · 149.1k · 81/100 MC

Borderlands Game of the Year

2023 · 89% · 32.5k · 81/100 MC

Tiny Tina's Wonderlands

2022 · 72% · 22.0k

Half-Life: Blue Shift

2001 · 92% · 18.8k · 71/100 MC

Aliens: Colonial Marines Collection

2012 · 61% · 11.6k · 45/100 MC

Duke Nukem Forever

2011 · 69% · 11.0k · 54/100 MC

Features & Capabilities

Multiplayer

Multi-player

Accessibility

Adjustable Difficulty
Playable without Timed Input

Input & Comfort

Custom Volume Controls

Other

Single-player
Save Anytime
Valve Anti-Cheat enabled
Family Sharing

Reception Metrics

Steam community

95%Overwhelmingly Positive · 25.6k reviews

24.3k positive · 1.3k negative

Curator recommendations

23.5k

Engagement Profile

All-time avg

short (5–15 hours)

Median

Typical completion time

2-week avg

Current engagement

Release & Availability

Release date	Nov 1, 1999
Developer	Gearbox Software
Publisher	Valve
Base price	$1.24 -75%
Platforms	Windows, macOS, Linux
Estimated owners	1M–10M
External links	Support

Localization Coverage

Interface / Subtitles (4)

English
French
German
Korean

Content Notes

Half-Life: Opposing Force includes violence throughout the game.

Editions & Packages

Buy Half-Life: Opposing Force