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.
wow the details are amazing! Fantastic work and good job to the mappers & texture artists.
Actually, there is only one new texture on this screenshot :D
hey how did you make that wall its look rounded can you teach me