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During the Pit Worm boss in Half Life: Opposing Force, you have to activate gearbox and valve to defeat it. Both of course being the names for the developers. : r/GamingDetails
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Gene Worm | Half-Life Wiki | Fandom
Worlds Collide - Half-Life Wiki Guide - IGN
Half-Life: Opposing Force (PC) Final Battle + Ending - YouTube
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Half-Life: Opposing Force Walkthrough Worlds Collide
