I've never known a game with a "help" that was as obscure and unreasonable to find as that in this game.
You would think "help" should be easy to find, and ideally on the title screen. Nope. Perhaps it's on the between-levels screens? Nope.
It's actually the last medal I got because it's maximum counter-intuitive to find. You have to be in the middle of a stage, click the Pause icon, then and only then is there a ? icon you can click to get the "help".