makes me wonder if anyone tried to unlock sound test/level select the old fashioned way. if you can unlock it like you could in sonic 1, 2, 3 & K it's possible it might be the same or similar to one of those methods. that would probably be the only way we will know for sure if there are no other hidden stages. I can't imagine they would make you get all the medals to do something all the other games let you do without any save data. if insta-shield is in the game I wonder how much stuff that would break, since some of the bosses you get really close to being able to jump and hit them but they're just barely out of reach.