Build awe-inspiring marble runs with Robbie Toys Marble Challenge. Assemble and build the marble maze to run and organise marble races. Each competitor chooses their coloured marbles and places them on the starting line. Lift the start barrier and they are off. Watch your marble race through the course and take on the traps. Use the bellows to speed up or slow down your marble. It includes an instruction sheet with colour illustrations of five different mazes you can try. Perfect for children aged seven years and above.