To evaluate gameful apps and games, we have recently developed a new set of guidelines for heuristic evaluation of gameful design in interactive systems, supporting the quickly growing gamification research area. Our set of 28 gamification heuristics allows rapid evaluation of a gameful system. This course will supply attendees with our gameful design heuristics and train them in using the heuristics on an example application (Duolingo). The course is structured into two 80-minute units, which will give the participants enough time to learn the new heuristics and apply them to the gamified application. Finally, at the end of the second unit, we will be discussing how to generate design ideas with the heuristics. The course instructors, Gustavo Tondello and Lennart Nacke, have both developed the gameful design heuristics and have experience in designing and evaluating gamified applications and teaching courses.