The Professor Layton (レイトン教授 Reiton-kyōju) series is a puzzle video game series for the Nintendo DS and Nintendo 3DS developed by Nintendo and Level-5. The series currently consists of six games and one film, with at least one more film in working development. Level-5 has also discussed a third trilogy in the works. The first three games are about Professor Layton and Luke's adventures together and their eventual parting of ways. The next three games and the film are prequels and are about how Luke and Layton met and their "original" adventures.
Each title consists of a series of puzzles and mysteries given by the citizens of towns that the main characters visit. It is not necessary to solve all the puzzles to progress, but some are mandatory and at certain points in the game a minimum number of puzzles must be solved before the story will continue.
The series has gone on to be one of the most successful Nintendo DS exclusive series, with the lifetime cumulative sales of Professor Layton games standing at 10 million units sold as of October 2010.