If you're really up for a challenge (and you've been able to do every move so far with perfect form), try doing box jumps by taking off only one leg and landing on the same foot. Moltzan's box is pretty high, but a low step works just as well. Try to do 10 on each side, concentrating on landing properly so you don't slip.
Training tip: If you want to avoid the impact or the possibility of a fall, you can simply step up and down on the box. It's still a fab workout for your glutes and quads!