From Djeco, this set features: A wooden building game of chain reactions requiring careful thinking. Children can copy the designs in the instructions booklet to build courses, or make up their own - the possibilities are endless! This chain reaction game helps anyone learn how speeds vary depending on the weight of an accessory and how space between elements changes the results. Helps children to understand beginner engineering principles. All the kits in the collection are compatible, for even more inventive action-reaction courses! 52 pieces ages 8+ Imported.