I've done the Super Monkey Ball thing back when it was released. Getting to the Master levels takes a lot of warping and some practice on the trickier Expert levels. You have to clear all 50 Expert levels, plus the 5 or 10 or whatever bonus levels, all without continuing. Once you reach the Master levels, you can go and get all 10 of them if you have infinite continues- just don't turn your game off. Master level 3 makes you die a lot. | 
