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Half-Life: Opposing Force

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|hidei=

|developer=[[Gearbox Software]]

|date=November 19, 1999<ref>{{IA|20000817174445fw_/http://www.sierrastudios.com/games/opposingforce/news.html|Opposing Force Arrives This Week!|SierraStudios.com (November 1817, 1999)}}</ref>

|genre=[[Wikipedia:First-person shooter|First-person shooter]]

|mode=[[Wikipedia:Single-player video game|Single-player]]

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