This guide will tell you how to get “Zombified” Badge + Zombie Bunny Morph in Roblox INFECTED DEVELOPER’S PIGGY. It will also let you know which map you will need to select.
The first thing you will need to do is to go to the Metro map. 
After that, head to the room of Bunny Morph.
Once you’re here, you have to touch the Bunny Morph in order to get the Badge. 
Now go to the Lobby and head to the Morphs Section to equip the Special Morphs. 