Below is a list of all the other unlockables available in Professor Layton and the Last Specter:
Layton Life (Japanese version): Complete the story. Mouse Alley Minigame: Collect 10 mouse badges by tapping mice running on screen, solve the Luke Foretells mystery and talk to Fische at the Crossroads. The Biologist's House: Beat the Laytonmobile Cove fish tank mini-game. The Boatman's House: Complete all Toy Train mini-games. The Flute Player's House: Complete the game. The Puppeteer's House: Complete all puppet shows. The Puzzle Master's House: Beat 167 puzzles.