Marble Rush - Interactive Marble Runs. Interactive marble run set - Build & Store Box Set M400 with 65 pieces and 5 MarBalls (marbles). The storage box with a practical carrying handle can be used as an additional component. Tube tunnels can be bent and twisted to create a flexible marble run. MarBalls can be launched into the funnel using the catapult launcher. There are countless building options and pathways with curves, tunnels, ramps, and more. Numerous interactive marble run elements are included. Building and playing with the marble run enhance motor skills, creativity, spatial thinking, and understanding of cause and effect principles, including various building instructions. Compatible with all Marble Rush sets to create massive marble run worlds.