Standalone Expansion

Half-Life: Opposing Force

ReleasedNov 10, 1999

Linux
PC (Microsoft Windows)
Mac

About

Opposing Force returns to the same setting as Half-Life, but instead portrays the events from the perspective of a U.S. Marine, one of the enemy characters in the original game. The player character, Adrian Shephard, is sent in to neutralize the Black Mesa Research Facility after a scientific mishap causes it to be invaded by aliens, but quickly finds that the Marines are outnumbered and slowly being beaten back by a second alien race and black operations units.

Developer: Gearbox Software
Publisher: Sierra Entertainment, Valve
Genres: Shooter, Platform, Puzzle
Themes: Action, Science fiction, Thriller, Warfare
Modes: Single player, Multiplayer
Perspective: First person
Age ratings: PEGI 16, ESRB M
Time to beat: 4 h rushed · 6 h normally · 5 h completionist
IGDB rating: 75 / 100 (409 ratings)
Also known as: hl.exe, OP4, OPFOR, HL: OPFOR, HL: OP4