A new collection of action-reaction construction activities. Game of chain reactions: the magic of connected movements: slow at first, then acceleration until the circuit concludes elegantly, and sometimes musically. Game of understanding: understand the ingenuity of a chain reaction, learn how speeds vary depending on the weight of an accessory, and evaluate distances between accessories. Game of construction: summon up all your skill and dexterity to position the accessories and create a circuit. Zig & Go – 27 pieces.