In entrepreneurial learning we work with challenges. Ideally, the students challenge themselves. In other words; they come up with their own challenge. On the Virtual Learning Environment of Codeniacs, students can enter into these challenges. There are also inspiring examples of challenges. A challenge can be preceded by an optional warm-up. Optional because students can choose to take the challenge immediately and take the risk of an "injury" for granted. We will explain one as an example. This is an example of a challenge in the Artificial Intelligence course that pupils should be able to do after about 4 lessons.