Build your own 70cm tall marble run completely out of paper! Race two marbles against each other from two starting points, and watch them roll through a funnel, along separate paths including a gravity-defying loop-the-loop, and down fun steps and amazing slopes. Entertaining to build and play with alike, this pack will keep kids and adults alike busy for hours. Simple mechanics and principles of engineering and physics are explained in bite-sized text alongside your instructions to build this paper engineering masterpiece. As fun to build as it is to play with!