First: need badges
second: why you all saying it's too hard? I found it rather easy... took lightning and kept upping damage until like lvl 5 or 6, then took stone... I let a few creeps pass during those levels, but less than 5.. over the course then take lightning spear then Zeus. and follow the maker's advice : priotritize damage, then number of spells.
 "Wizard Defense"){kind=icon}