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Half-Life: Opposing Force Hints
Giant Tentacles
Giant tentacles are huge, well, tentacles that have a very sharp beak on one end. Tentacles are unbeatable using conventional weapons. You will usually just have to avoid tentacles rather than fight them.
Tentacles can only hear noise. They cannot see you. Hence, you can either creep past them using the walk modifier or you can distract them by tossing grenades in the opposite direction. Just remember, one hit from their beak will usually kill you.
