Q-BA-MAZE is a unique system of colorful cubes that interlock to form an exciting marble run. The big difference? The configurations are UNLIMITED and the colors are BOLD and BRIGHT! This striking Q-BA-MAZE set features an array of fun rainbow-hued colors; five original colors plus four new colors! Build fiery dragons, butterflies with kaleidoscopic wings or towers that resemble dazzling swirls of DNA! The Spectrum Set offers 120 quality colorful cubes for building spectacular designs plus 30 steel marbles allowing for a live demonstration of probability, physics and art, all in one! Challenge your child's spatial skills with hours of continuous play! Follow the step-by-step directions or experiment with your own original creations; Well-crafted and durable pieces leave you with a new experience every time; Double exit cubes leaves everyone wondering,"Which way will the marbles go?"; Encourages imaginative thinking and cooperative play; Cubes are made from phthalate-free and BPA-free ABS plastic; The Spectrum Set is just one of five Q-BA-MAZE 2.0 building sets?check out them all!; Marbles are nickel plated steel balls. They are not magnets.; Age Recommendation: Ages 6 and up;.