The Professor Layton formula is pretty simple, take an interesting story and mix it with mind-boggling puzzles and you've got this game.
Layton's puzzles never disappoint in being both thought provoking and witty, and the game is just a fun, educational game to play. However, the puzzles are hard, and unless a parent wants to help their child, then this game should be played by kids who can handle being a bit frustrated at not being able to figure out a puzzle at first glance.
The series itself if pure perfection, and really deserves to be played my more people.
I highly recommend this game, and I honestly have no negative points about it right now.
*NOTE: Being a teenager, my sense of what some parents might find suitable for their child might differ from what said parents actually think. I didn't really pick up on anything bad, persay, but maybe it's just because my sense of "bad" things is just distorted at this point.
But seriously, buy this game. It's good.