Half-Life: Opposing Force — StrategyWiki

Half-Life: Opposing Force is an expansion pack for Valve Software's first-person shooter video game Half-Life. The game was developed by Gearbox Software and published
Half-Life: Opposing Force is an expansion pack for Valve Software's first-person shooter video game Half-Life. The game was developed by Gearbox Software and published

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Half-Life: Opposing Force storyline, Half-Life Wiki

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