The flexible use of different problem-solving strategies is key for processing mathematical problems successfully. The question of how future teachers can be supported to learn about such strategies and their use in the mathematics classroom is consequently of high relevance. In a one-semester university course, we provided a unit on problem solving focusing on the use of primary-school students’ problem-solving strategies. To support the pre-service teachers’ learning, we designed two types of cartoon vignettes: short cartoons, each illustrating a different problem-solving strategy (e.g., work backwards) and more complex cartoons providing the opportunity to analyse how students make use of different strategies and/or struggle while solving a non-routine problem. Our evaluation showed that the participants perceived the cartoons as valuable learning opportunities. Learning to analyse students’ problem-solving strategies could be supported but remained a challenging task.