Pen and paper prototyping is a highly relevant skill to videogame design, practised by companies such as Denki. Rather than getting caught up in hardware or artwork, simple physical prototypes allow you to really focus on the rules of the system. Who better to talk to about it than a veteran RPG, board and card game designer? James Wallis is best known for the storytelling card-game Once Upon a Time, which celebrates its 20th anniversary this year. He’s worked with Sony, Hasbro, Channel 4, the BBC, Sky and Games Workshop, and used to lecture in game design at the University of Westminster.