The reliance on auditory cues kinda reminds me of Rhythm Doctor's gameplay style. You see the pattern, you learn the pattern, and then you have to remember the pattern. The balance between traditional gameplay and pure rhythm gameplay is spot-on, and once you've learned the level, you can challenge yourself to Ultimate Memory Mode to really test your mastery. I haven't really tried Hidden File mode yet, but it seems to mainly be an optional challenge that's not tied to in-game rewards in any way.