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Half-Life: Opposing Force

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 and Sciences.

95%
Overwhelmingly Positive
DeveloperGearbox Software
PublisherValve
Release DateNov 1, 1999
$4.99
Peak Players5.4K
PlatformsWindows · macOS · Linux
Action
AI Review Summary

Half-Life: Opposing Force is a highly-regarded expansion that offers a fresh perspective on the Black Mesa incident through the eyes of Corporal Adrian Shephard. While it is celebrated for its ambitious new weapons and experimental mechanics, some players find the difficulty spikes and certain new enemy types to be frustratingly unbalanced.

Pros

  • Offers a compelling alternative perspective playing as an HECU soldier instead of a scientist.90%
  • Introduces creative new weapons and gadgets, such as the grappling barnacle and Race X weaponry.85%
  • Features strong worldbuilding and environmental storytelling, particularly within the training sequences.80%
  • Widely considered to be a superior and more substantial expansion compared to Blue Shift.75%
  • Includes an underrated and enjoyable multiplayer component.60%

Cons

  • Significant difficulty spikes and frustrating enemy encounters that can feel poorly balanced.85%
  • New 'Race X' enemies are often described as overly tanky and annoying to fight.80%
  • Occasional technical bugs can sometimes impede game progression.50%
  • Later levels can feel repetitive or overly reliant on enemy spam to create challenge.70%

Notable Mentions

  • The protagonist, Adrian Shephard, has become a cult favorite with fans hoping for his return in the series.
  • The game is noted for its gloomy and terrifying atmosphere compared to the base game.
Confidence: 58%
Based on the 127 most relevant reviewsGenerated on Aug 28, 2026
Game Vitals

Live snapshot

Player Activity

Current peak
152
Peak · last 90 days
203
All-time peak
5.4K

Price

Current price
$4.99
Lowest tracked
$0.99since Nov 23, 2025

Review Sentiment

Launch week
—
Last 30 days
94%
All-time positive
95%
Review Statistics
Total Reviews28.9K
Positive: 27.6K (95%)Negative: 1.3K (5%)

4%

Reviews from Steam Deck

0%

Dev Response Rate

14h

Avg Playtime at Review

82%

Credible Reviews