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 new weapons and abilities. For further information please check this mod's Official Page.
If you are stuck after going through the hidden vent and finding that the only possible victim is dead - here's your fix.
THis messed me up first playthrough, but that was long ago so I just replayed, it's good you provided a fix!
Excellent, thanks.
Nice
This comment is currently awaiting admin approval, join now to view.