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: create runs shaped like rockets, robots, butterflies, or whatever design you want!This kit includes:Q-BA-MAZE Rails Extreme, complete with 18 straight-away rails that connect easily to any cube or to each other to create tracks that send your marbles zigzagging through the maze of colorful cubes. With another 82 cubes, 4 coaster tubes, 4 marble catchers and 30 steel marbles, the possibilities are endless! • Revolutionary cubes create endless paths and artistic build possibilities• Encourages imaginative thinking, STEAM skills and cooperative play• Follow the step-by-step directions or experiment with your own original creations• Well-crafted and durable pieces are made from phthalate-free and BPA-free ABS plastic• Double exit cubes allow for several different pathways!• Marbles are nickel plated steel balls. They are not magnets.