Concept Art Collection
After you've completed Professor Layton and the Unwound Future, 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 Diabolical Box, select the Hidden Door menu, then select the Ticket To Time Travel option. Input the code, and you'll unlock a collection of concept art.
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||How to Unlock |
|Concept Art Collection
||Complete Professor Layton and the Unwound Future to obtain a code, then input the code in the Hidden Door menu.