If you have trouble solving puzzles on any Professor Layton game here are a few tips.

  1. Use Hint coins, sometimes when it says you won't recieve anymore tips on the first or second hint it will give you a couple more
  2. There is no time limit for any of the puzzles, so take your time, clear your mind and relax.
  3. If you run out of hint coins, tap all over the screen and you may find some in the weirdest of places

If none of these tips don't help you, you can always use cheat codes or find the answer online.