The Imp Zombie is the combination of two small zombies. (Or at least one of them should be a small zombie to have 50% chance for an Imp Zombie.) Like other Combined Zombies, each of their combined "parents" should have a specific mutation for that zombie to have too.
Level Required: 25 (or 27 in Zombie Farm 2)
Game description: Use the Zombie pot to grow this zombie.
Time: 1 hour 10 minutes (10 minutes in zf2)
Cost: 110 Gold (2 small zombies)
Requires: Zombie Pot