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! Build shapes like flowers, fish or dinosaurs! Challenge your child's spatial skills with hours of continuous play. All Q-BA-MAZE kits are compatible.This kit includes:The fun-sized Q-BA-MAZE Big Box set, featuring 72 cubes with 3 types of exits and 20 steel marbles! It’s a variety set great for hours of entertainment, without too many parts to overwhelm younger builders.• The Big Box Set is just one of five Q-BA-MAZE 2.0 builder sets—check out them all!• 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.