Half-Life: Opposing Force

Developed by Gearbox Software
Release date: 10 Nov 1999
ShooterPlatformPuzzle
Half-Life: Opposing Force
Publisher: Sierra Entertainment
Publisher: Valve
Developer: Gearbox Software
Platforms: PC (Microsoft Windows)LinuxMac
Themes: WarfareActionScience fictionThriller
Player perspective: First person
Game modes: Single playerMultiplayer
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