Layton's challenges are the hardest puzzles in the game. They are found under the bonuses section. Each one has a different way of being unlocked.
| Challenge | How to unlock
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- The Puzzle Keeper's House
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| - Beat all ten toy car courses.
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| - Complete all 12 parrot delivery errands.
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| - Complete all three picture books.
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- The Time Traveler's House
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After you've completed Professor Layton and the Diabolical Box, you'll be given a special code. These codes are unique for each DS system. Copy down that code, access the Top Secret bonuses of Professor Layton and the Unwound Future, select the Hidden Door menu, and input the code. You'll unlock the Diabolical Box Reopened Puzzle, an extra challenge that features the antagonist from that game.
Once you acquire enough Picarats, you unlock the following options in the top secret section.
| Option | How to unlock
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- Additional Character Profiles
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More Professor Layton and the Unwound Future Cheat Codes @ CheatListingsMore Professor Layton and the Unwound Future Cheat Codes @ AbsolutCheats