Half-Life: Opposing Force is a FPS, Action, Classic PC game, developed by Gearbox Software, available on Steam and published by .
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.
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FPS Action Classic Sci-fi Singleplayer Shooter First-Person Aliens 1990's Adventure Atmospheric Military Story Rich Silent Protagonist Great Soundtrack Gore Puzzle Co-op Moddable Retro