Half-Life: Opposing Force Steam Key GLOBAL

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Release date:Nov 1, 1999
Publisher:Valve
Platform:Steam
Developer:Gearbox Software

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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