Pet Zombies 3D Cheats for 3DS
To get the Brain Trophy, enter the following code in the Options menu, using the 'enter cheat' setting:
Unlock Brain Trophy:
All you need to do is have the teddy bear in your toys throw it at your zombie and it is instantly lv.20! You get all of the cash you would have by leveling it up legit but you get it faster! Happy gaming XD
p.s it works on all level zombies!