National Geographic Glow in the Dark Marble Run - 50pc: Educational Focus on Creative Thinking & Engineering, Grades 2-11

This marble run construction set allows kids to build an endless array of marble runs. Pieces connect easily, and the set includes 8 glow-in-the-dark marbles in a variety of colors. A full-color learning guide provides tips on building a great marble run, as well as insight into the science of motion and gravity.