156 is a puzzle ID number. In the various games, it may refer to one of these puzzles:
- 156 - ABCs...and Ds in the game Professor Layton and the Unwound Future.
- 156 - Which Direction? in the game Professor Layton and the Last Specter.
- 156 - Lighten Up 3 in the game Professor Layton and the Azran Legacy.
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