GraviTrax Junior is an interactive marble run system for boys and girls aged 3 and over: With GraviTrax Junior, children don't just build simple marble runs. By individually decorating with lovingly designed elements, children create their own themed worlds. GraviTrax Junior focuses on age-appropriate learning content. Motor skills and spatial thinking are promoted through the free design of the marble runs. By exploring the rolling behavior of the balls, the principle of cause and effect is experienced first hand. Playing with the (animal) figures and decorating the themed worlds promotes creative role play and children's imagination. With various extensions, children can enlarge their marble runs and redesign them again and again - long-lasting fun guaranteed.