Over the last year, he started grading two of his classes (both involved with game design) using a system based on “experience points,” or XP, similar to the way gamers in World of Warcraft and other massively multiplayer games award points for various tasks. Students started the year at level one, with zero XP, and then gained points — and higher grades — by completing “quests” and “crafting,” which corresponded to giving presentations and doing exams and quizzes. Students also formed “guilds” similar to the gaming groups that rule WoW and other multiplayer games. Sheldon says that his students seemed far more engaged than they had been before.