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Half-Life Hints
Tranquilizer Crossbow
The tranquilizer crossbow accepts 5-dart clips +50 darts max. It can be used underwater.
The crossbow is the best sniping weapon in the game. Switch into the sniping option with the secondary attack key to maximize precision. The tranquilizers will usually take out a soldier or alien slave with one shot, no matter where you hit them or what difficulty level you're playing on. Therefore, a shot in the foot might down a G.I. more quickly than a shot to the head. Pay close attention to your ammo, though. There are not that many tranquilizer clips in the game and it takes quite a while to load darts and even more time to reload a clip.
Also note that if you load a saved game while the crossbow's sniper scope is on, then it will remain on no matter what weapon you have readied. However, this can be inconvenient, so either ready the crossbow and hit the secondary fire button a couple of times, or just quit and rerun the entire game.