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Half-Life: Opposing Force Hints
Tripmines
Tripmines are the ultimate in silent traps. Set one on a wall, tempt your enemy from behind and watch as your enemy unknowningly breaks the tripmine's laser-beam, triggering the explosive. It is very fun to use tripmines creatively, outsmarting both NPCs and human players, either in singleplayer or multiplayer. Tripmines must be attached to some form or structure. They cannot be set in the air. You can hold 5 tripmines at any time. They are functional underwater.
