The number 031 can refer to: * Puzzle Racetrack Riddle from Professor Layton and the Curious Village * Puzzle Pass the Apples from Professor Layton and the Diabolical Box * Puzzle False Memory from Professor Layton and the Unwound Future * Puzzle Light Height from Professor Layton and the Last Specter * Puzzle Emperor's Throne from Professor Layton and the Miracle Mask * Puzzle For the Heart! from Professor Layton and the Azran Legacy * Puzzle Animal Pens from Professor Layton vs. Phoenix Wright: Ace Attorney