When you first start the game you should be able to select whether or not you want hint-free game play or not. If you want it, there are stones in various places all over Termina. If you don't want it, the stones aren't there.
Easy peasy.
Yeah, I agree. That's probably the most sensible way for doing it, although it makes it so people who aren't the best at MM, can beat the game and say they beat it. There'd have to be some sort of catch if you picked the version with hints in - I wouldn't want people who need hints, to earn the bragging rights you achieve by completing a game.