GraviTrax Junior gives children aged 3 and over a child-friendly introduction to themed marble run worlds GraviTrax Junior is an interactive marble run system for children aged 3 and over. Boys and girls can create their own marble run worlds, which can be flexibly decorated to create individual themed worlds. Building and playing fun are combined. GraviTrax Junior can be extended as required by adding components or special elements. Sets with themed decorations allow children to create their own worlds - for long-lasting playtime fun. 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. Children can create their own themed worlds by decorating them individually with lovingly designed elements. GraviTrax Junior focuses on age-appropriate learning content. Motor skills and spatial thinking are encouraged through the free design of the marble runs. By exploring the rolling behaviour of the balls, the principle of cause and effect is experienced at first hand. Playing with the (animal) figures and decorating the themed worlds encourages children's creative role play and imagination. Various extensions allow children to extend their marble runs and design them again and again - long-lasting fun is guaranteed.