PCGame

Half-Life: Opposing Force

Sci-fi first-person shooter revisiting Black Mesa from a soldier's perspective

Gearbox Software · Published by Valve · Released Nov 1, 1999

Action

Reviews
Overwhelmingly Positive
95% of 29K
Recent reviews
Very Positive
92% of 224 in 30 days
Players
94
daily peak, Nov 7, 2026
Steam Deck
Playable
Last update on Steam
6 years ago
Aug 19, 2020
Minimum PC
–
not published

What is Half-Life: Opposing Force?

A science-fiction first-person shooter set at the Black Mesa Research Facility. As a military specialist sent to eliminate Gordon Freeman, you fight alien enemies with new weapons through a separate single-player episode. Multiplayer is also included.

For you if...

  • +you like eerie, atmospheric single-player shooters
  • +you prefer fast-paced action over slower exploration

Not for you if...

  • −you dislike campaigns that drag in later sections
  • −you prefer a small, streamlined weapon selection

What players say

95% of 29,022 reviews are positive · 92% of 224 in the last 30 days

Players praise the expanded arsenal, new enemy types, faster combat, and the military perspective on the Black Mesa incident. The most common complaints are severe late-game difficulty spikes, durable enemies, and unclear routes or puzzles; some players also report elevators that can halt progress.

Players over time

▼ -24% vs a month ago

Players online on Steam, one sample a day.

Highest since Sep 2026: 129 players on Oct 5, 2026.

Show the data
DayPlayers
Nov 7, 202694
Nov 6, 202682
Nov 5, 202678
Nov 4, 202679
Nov 3, 202678
Nov 2, 202687
Nov 1, 202681
Oct 31, 2026107
Oct 30, 202658
Oct 29, 202677
Oct 28, 202671
Oct 27, 202642
Oct 27, 202664
Oct 26, 202669
Oct 25, 2026106
Oct 24, 202694
Oct 23, 202672
Oct 22, 202668
Oct 21, 202683
Oct 20, 202671
Oct 19, 202690
Oct 18, 2026103
Oct 17, 2026113
Oct 16, 202686
Oct 15, 202683
Oct 14, 202690
Oct 13, 2026101
Oct 12, 202689
Oct 11, 2026106
Oct 10, 2026114
Oct 9, 2026109
Oct 8, 2026101
Oct 7, 2026101
Oct 6, 202697
Oct 5, 2026129
Oct 4, 2026121
Oct 3, 2026103
Oct 2, 202683
Oct 1, 202674
Sep 30, 202678
Sep 29, 202674
Sep 28, 202686
Sep 27, 202684
Sep 26, 202692
Sep 25, 202677
Sep 24, 202681
Sep 23, 202665
Sep 23, 202681
Sep 22, 202688
Sep 21, 202693

Screenshots and trailer

Half-Life: Opposing Force screenshot 1

Half-Life: Opposing Force system requirements

As published by the developer.

Can my PC run Half-Life: Opposing Force?

The published requirements do not name a graphics card we can compare.

Set up my 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

Does Half-Life: Opposing Force have co-op or multiplayer?

Yes: multiplayer (mode not specified). It also has a single-player mode.

Does Half-Life: Opposing Force run on Steam Deck?

Playable Playable: it runs on Steam Deck with some adjustments.

  • Default controller config not fully functional
  • Sometimes shows mouse, keyboard or non-Deck controller icons
  • Some text entry requires manually opening the on-screen keyboard
  • Some in-game text is small and may be hard to read
  • Native resolution not supported
  • Default graphics settings perform well on Steam Deck

PC version details

DRM
None declared on Steam
Controller
Keyboard and mouse
Platforms
Windows, macOS, Linux
Steam features
Family Sharing
Languages
Text only: English, French, German, Korean.

Does Half-Life: Opposing Force use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Nov 7, 2026. How to filter AI games on Steam

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