Parcours 1 is the main model of the kit.
The following three videos show three skin building steps of the first model. This allows you to check whether everything has been assembled correctly after each individual construction step. It also shows how the individual parts are aligned at the start. If something goes too fast, simply repeat or rewind.
Parcours 2 - Building instruction page 29 - 46
The second model is also an exciting challenge. In the tutorials the building steps become more visible. Especially the correct placement of the balls in the course is helpful.
Parcour 3 - Building instruction page 47 - 65
With the third model, the main steps also help with assembly and start.
More information around the topic chain reaction, all functions and special features of the modular system as well as suggestions and ideas are explained here.