Attention all little marble run fans! The parts of this Junior marble run are very easy to assemble, so that the extra large, colorful wooden balls can start their journey across the construction site. Young motor skills beginners in particular will be happy during their imaginative play. The exciting construction site elements playfully teach the cause and effect principle. It is expandable and combinable marble fun with a learning and "Aha!" effect! With this marble run, even small children can playfully experience cause and effect principles and the perception of rolling objects is trained. The easy-to-grip design ensures that children are not overloaded while playing and the extra large balls provide extra safety and fun. The different parts of the play set can be easily grasped and assembled by small children's hands. The well-known plug-in principle of the wooden train offers a variety of construction options and thus encourages the fun of experimenting and imaginative play. Older children can also roll cars or marbles on the wooden tracks.