Half-Life: Opposing Force Gallery
Games from the Half-Life franchise
Half-Life: Opposing Force Feed
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Half-Life gets new patch, almost 19 years after launch
They're still waiting for you, Gordon
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Prospekt: Half-Life Opposing Force Fan Sequel Released
Adrian Shephard returns!
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RPS Discusses: Do Expansion Packs Still Matter?
And which are the best?
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Have You Played... Half-Life: Opposing Force?
Marine's core