There's one tricky thing about all bosses that I like to ask :

When you get to the boss rush on the cassino, an all bosses run would require you to beat all the 9 bosses on the roulette. However, say that you kill 5 bosses and then die. If you kill the other 4 bosses and advance (remembering that since is a roulette, you may have to kill again one of those that you killed before), the run will be considered a legit all bosses, or to do it you'd have to beat all 9 roulette bosses + dice head without dying?