Professor Layton and the Last Specter Cheats - Nintendo DS

Unlock Top Secret Options
Art - Acquire 4,600 Picarats and beat the game.
Additional Character Profiles - Solve all 170 puzzles.
Movies - Acquire 5,500 Picarats.
Character Profiles - Acquire 4,300 Picarats and beat the game.
Character Voices - Acquire 5,200 Picarats and beat the game.
Music - Acquire 4,900 Picarats and beat the game.

Unlock Bonuses
Layton Life (Japanese version only) - Complete story mode.
Mouse Alley Mini-Game - Collect ten mouse badges by tapping mice that randomly run across the screen, solve the Luke Foretells mystery, then talk to Fische at the Crossroads.
The Flute Player's House - Beat the game.
The Puppeteer's House - Accurately complete all three puppet shows.
The Biologist's House - Complete the Laytonmobile Cove fish tank mini-game.
The Boatman's House - Complete all ten Toy Train mini-games.
The Puzzle Master's House - Solve 167 puzzles.

Hidden Door Concept Art
In the Top Secret menu, there is a section called The Hidden Door. It is only unlocked by entering a 3DS system-unique code given to you in Top Secret menu in Professor Layton and the Miracle Mask. Doing so unlocks a special gallery of concept sketches and artwork, and a code that can be used to unlock content in Miracle Mask.