GraviTrax: Starter Set XXL by RavensburgerThe interactive ball track system from Ravensburger. With the GraviTrax Starter Set XXL, the inventive spirit is unleashed and you can dive straight into the huge, endlessly expandable marble run universe. With over 240 parts and a variety of building blocks, nothing stands in the way of surprising and action packed building fun. The example tracks and instructions provide a playful introduction to the GraviTrax universe and encourage creativity for