Half-Life: Opposing Force

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developerGearbox Software
publisherSierra Studios
Valve Corporation

release date

NANovember 1st, 1999

EUDecember 3rd, 1999

M for Mature

Single Player Sci-Fi First-Person Shooting Aliens Military Puzzle

addedby ShadowNewhouse
on April 5th, 2023 last updatedby blustrkr
on May 9th, 2025