This is a challenging game that will show your rabbit's personality. My clever doe had this figured out in no time. Even on the beginner level her method was to remove the sliding disc altogether! However, my little buck is a Netherland Dwarf with a flat little face and nose and he had trouble getting the treats out of the holes. For this reason i've never bought him a vegetable ball as he lacks a nose pointy enough to poke through the gaps. I'm not certain he'll be able to pick up the hollow knobs with his little mouth either. Perhaps the cheeky darling prefers not to work too hard for his treats (and with his cute face, he doesn't really have to)!