Zig and Go, track building set A collection of sets for building fascinating chain reaction tracks. The movement, slow at first, but then increasingly alert, leads to the course with changes of direction, curves and dynamic surprises. Construction game: children will have to use their skills to position the pieces and create a course. Chain reaction game: children learn about the causality of movements, the ingenuity and magic of chain reactions, the cause-effect relationship! Thinking game: children have to think about how fast the pieces will move - which depends on their weight - and to approximate the distances between them. Step-by-step instructions for 3 tracks are provided. Video accessible via a QR code. Invent endless courses for hours of fun, alone or with others. Contains 27 wooden pieces and 2 glass balls. All kits in the collection are compatible with each other, for increasingly inventive action-reaction courses. Recommended age: +7 years. Made of wood and metal. According to EN71&ASTM regulations. WARNING: Not recommended for children under 3 years, contains small parts, choking hazard. To be used under the direct supervision of an adult. Manufacturer: Djeco, France