Series: Half-Life

Genres: Action, FPS, Shooter

Developers: Gearbox Software

Publishers: Sierra On-Line,Valve Corporation,Buka Entertainment

Released: 1999-11-19,2013-07-31,2013-07-31

Platforms: Windows,OS X,Linux

Engines: GoldSrc

PCGamingWiki: https://www.pcgamingwiki.com/wiki/Half-Life:_Opposing_Force

SteamDB: https://steamdb.info/app/50

GOGDB: N/A

Wikipedia: https://en.wikipedia.org/wiki/Half-Life:_Opposing_Force

License: commercial

Keywords: non-player character, one-man army, run and gun, profanity, wasd movement, shooting range, alien languages, death, military, easter egg