It's fast, it's twisty, and it's totally designed by you! The Marble Madness Kids Marble Run by ELC is an exciting construction kit featuring the most fun marble run around. This engaging 50 piece activity set gives you everything you need to design your own obstacle course, just the right size for a little marble. The Marble Madness Kids Marble Run includes loops, twists, and bendy tubes for you to piece together. Create your own wacky design and watch your marble go! ELC's Marble Run from Educational Toys Planet is tons of fun and helps preschoolers and young children learn about cause and effect, problem solving, and even early physics skills. Kids will enhance their fine motor skills as they build their marvelous runs. Play on your own, or race your friends' marbles through the obstacle course. Great for creative minds of all ages!