In the falling sand game how do you make a zombie?

HA! AND AGAIN HA!you dont make zombies there already their but it depends on which one you are playing * pyro sand 2 - NO * X falling sand - NO * falling sand - NO * Hell of sand - YES * Sand - YES * Pyro sand -NO I hope this helps P.S. On the ones that have zombies you can change the amount by using the slider or clicking until you ave the desired amount