The number 131 can refer to: * Puzzle Heavier or Lighter? from Professor Layton and the Curious Village * Puzzle How to Escape? from Professor Layton and the Diabolical Box * Puzzle A Pricey Pen from Professor Layton and the Unwound Future * Puzzle Dark Maze from Professor Layton and the Last Specter * Puzzle Jewels to the Lock from Professor Layton and the Miracle Mask * Puzzle Forest Friends 2 from Professor Layton and the Azran Legacy