Half-Life: Opposing Force
Series: Half-Life
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Expansion to Half-Life following HECU Marine Adrian Shephard during the Black Mesa incident, introducing new weapons, allies, and the alien Race X.
Released: 1999-11-01
Developer:
Gearbox Software
Writers:
Marc Laidlaw
Randy Pitchford
Publisher:
Sierra Studios
Composers:
Chris Jensen
David Kelvin
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