Half-Life: Opposing Force

Specifics

FIRST RELEASE:	1999-11-18
DEVELOPERS:	Valve, Gearbox Software
PUBLISHERS:	Sierra Studios
GROUPS:	Half-Life Series
GENRES:	First-Person Shooters (FPS)
PLATFORMS:	IBM PC
ENGINES:	GoldSrc (Goldsource)

Game menu

Easter eggs

Easter Eggs in Half-Life: Opposing Force

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