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Half-Life: Opposing Force Hints
Advanced Zombies (Hybrids, Mawmen)
Advanced zombies are headcrabs that have fully overtaken their hosts' bodies. Advanced zombies are very powerful; they are a bit faster than regular zombies and they can now launch acidic globs of mucus at you.
It is better to stay back, avoid the globs of mucus, and plant a few shots in their foreheads. One or two shots to the head from the Desert Eagle will kill an advanced zombie. They may be somewhat challenging but they aren't very smart. Use that to your advantage.
