(download this if you have Half-Life) Half-Life: Opposing Force is the official game expansion for Half-Life. In Opposing Force (Op For), players return to the Black Mesa Research Facility to experience an entirely new episode of single-player action.
Many people have played Half-life and seen the heroics of Gordon Freeman, but many people don't know Marvin. Marvin was hired as a part time janitor right before gordon destroyed everything. at the same time as gordon w
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