Odyssey Marble Roller Coaster and Elevator Play Set. Aspiring architects can build their own marble roller coaster in various configurations with this indoor toy. Play set features an enclosed suspension wire. Teach children the science concepts of physics, gravity. and inertia as the marbles spin down the track like a roller coaster. Then, watch as the marbles are lifted to the top of the roller coaster with the elevator. Set includes 270 pieces. Requires two (2) AA batteries (not included). Click here to go to Overstock.com. $36.50 + $0 Shipping on Entire Order.