A Tunnel is a covered track section where the marbles can cross other tracks or just to "hide" the marbles for a short time. Tunnels aren't really obstacles because there are usually no obstructions in the track. Sometimes, tunnels can be narrower than the surrounding track sections. Tunnels can also be made with tubes or pipes to cross other courses.

IMG 4035
Community content is available under CC-BY-SA unless otherwise noted.