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Half-Life: Opposing Force Hints
Snarks
Snarks are little aliens that run around and attack any living beings in the relative vicinity. Use them to clear out rooms and to determine what type of enemies may be waiting in the next room. Drop a few snarks into a room and listen for what types of weapons and cries are heard. You should be able to determine what might be waiting for you around the corner. You can carry 15 snarks at any time. Snarks can be used in water, but as they can float, they aren't very useful there.