Hidden Door Concept Art
There is a section called 'The Hidden Door' in the 'Top Secret' menu which becomes unlocked when you enter a 3DS system-unique code given to you in the 'Top Secret' menu of Professor Layton and the Miracle Mask. In the 'Hidden Door' section you will find a special gallery of concept sketches and artwork as well as a code that can be used to unlock content in Professor Layton and the Miracle Mask.
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