Build the ultimate ball run with this large SmartMax® magnetic construction set. In contains amazing 74 pieces! With endless possibilities, you can build a variety of structures and let the balls roll. Mega Ball Run contains special parts, such as tubes and X-shaped parts, which have 4 magnetic ends. Of course, all parts can be combined with all SmartMax® sets. As a result, great new buildings are created time and again. For 3 years and up.