This page details bugs of Professor Layton and the Diabolical Box.
Being a game centered on logic puzzles, it's no surprise there are some bugs in the game's own internal logic.
Unaccepted Correct Answers#
In Puzzle No. 012, "Clouds and Sky", an oversight causes only 6:4 to be accepted as a correct answer despite other equivalent ratios such as 3:2 or 12:8 also being correct. This suggests that the solution is a hardcoded value and the game neglects to simplify the ratios before comparing them.