Welcome to Half-Life Answers. What would you like to know?

You have to kill Tentacle, Big Momma, Gargantua and Nihilanth. You can skip other enemies.

-but has it really been accomplished and documented? because many enemies seem unavoidable.

Why the hell would you NOT want to kill the enemys?

-for the challenge of it! (like some people play Doom with as little killing as possible)

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