Professor Layton and the Diabolical Box Unlockables
Layton's Challenges
The Animal Lover's House (Puzzles 145,146,147) - Get the hamster to lose weight.
The Musicians House (Puzzles 139,140,141) - Fix the camera, then take pictures wherever one of the nine camera icon appears, and find three differences in each photo.
The Sweetheart's House (Puzzles 148, 149, 150) - Beat the game.
The Tea Master's house (Puzzles 142,143,144) - Get all of the ingredients for tea, and find the different brews. When you see a character with sweat drops, give them the type of tea they ask for.
Unlock Character Profiles List
Beat the game.
Unlock Art Gallery
Beat the game.