Build Your Own Marble RunGet ready for some awesome racing fun with the Build Your Own Marble Run, our most challenging build yet. This innovative cardboard marble run is assembled using slot together techniques no glue, no mess, no fuss. Everything you need is provided in the kit follow the detailed instructions: press out the pre cut parts, build and watch them go! Wind the handle to raise the 10 swirly glass marbles up the elevator; then watch as they speed down one of the