Professor Layton and the Last Specter for the Nintendo DS family of systems is the fourth installment in the Professor Layton puzzle adventure series. It begins a new trilogy that is a prequel to the original games set three years before the events in Professor Layton and the Curious Village?. The game contains more puzzles than any in the series to date. As a North American exclusive to the overall Professor Layton and the Last Specter package a bonus role-playing game called Professor Layton's London Life containing more than 100 hours of additional content will be available to players from the start of the game.