How do you get gray zombies in zombie farm?

Answer 1

First off, the gray or "special" Zombies don't come out gray. They come out whatever color zombies you mix in your zombie pot. You can't plant special zombies themselves, and you have to be level 25. First you need to by the Zombie Pot if you are level 25 (it costs 6000 gold). Then you mix two same type zombies (color doesn't matter) like mini's. And if you put in two mini's, you will get a imp zombie!