Rhythm Thief? Isn't that the game that everyone said was really good, but almost nobody bothered to play?
EDIT:
So is anyone else playing Rhythm Thief yet? If not, you should be!
I've been short on time so haven't made much progress... but wow, the production values are great. Even though I typically don't enjoy rhythm games, the mix of Layton-esque exploration and story with a variety of different rhythm-based mini-games is a lot of fun!
Definitely a hidden gem for 3DS. It really makes me wish I had a physical copy to share the fun with my kids.