161 is a puzzle ID number. In the various games, it may refer to one of these puzzles:
- 161 - Black Hat, White Hat in the game Professor Layton and the Unwound Future.
- 161 - Lily Pad Leapfrog 2 in the game Professor Layton and the Last Specter.
- 161 - A Groovy Lever 2 in the game Professor Layton and the Azran Legacy.
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