 Trondheim originally stated in interviews that the authors "weren't crazy" and wouldn't release 300 books, trusting the reader to fill in the blanks of the missing numbers.However, in later interviews, he hinted that he had changed his mind and was seduced by the idea of creating a long-running and complex series of 300 books, which seemed possible with the collaboration of several different authors.A third sub-series called "Donjon Bonus" exists of different editions (black and white or smaller format omnibuses) and work outside the comics, like the role-playing game "Clefs en Mains".