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

Reviews: Overwhelmingly Positive; 95% of 29K
Recent reviews: Overwhelmingly Positive; 96% of 209 in 30 days
Playing now: 65; peak 24h 81
Steam Deck: Playable
Last update: 6 years ago; Oct 8, 2019

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 29,023 reviews are positive · 96% of 209 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.

Screenshots and trailer

Half-Life: Opposing Force system requirements

As published by the developer.

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