The children are programmers and help the computer to solve a puzzle. They sit together in a circle, observe the mentor and contribute to solving the problem. The mentor presents the exercise, explains and asks the children questions that will lead them to the answer.
In a playful way the children learn to tackle a big problem in small parts, to formulate clear instructions and to recognize how they can be made more precise. They explore how to systematically reduce instructions. They train to anticipate results and proceed methodically.