Zombie Edition is a mod based on original half-life concept, but you will play as a headcrab and, what is more interesting, as a zombie. Zombies can mutate to change their characteristics into three types and every type will have at least six upgrades including using new weapons and abilities. For further information please check this mod's Official Page.
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That and other three screenshot (6,7 and 8) are from map, that I'm making. This is corridor. All doors can be opened and every leads to the room. That place wasn't attacked almost at all, so it has no dead bodies, blood splatters, it's clear and tidy. For now.