Cubes that keep you guessing and rails that go the distance really ramp up your marble run fun! The unique design of Q-BA-MAZE cubes allow for a limitless range of configuration options. The 7.5-inch straight-away rails connect easily to any cube or to each other to create tracks that send your marbles zigzagging through the maze of colorful cubes. Plus, the precision engineering of the double-exit cubes gets everyone wondering, "Which way will the marbles go?" Includes 82 cubes, 18 straight-away rails, 4 coaster tubes, 4 marble catchers and 30 marbles.• Revolutionary cubes create endless paths and possibilities• Precision joints provide exceptional stability• Smooth cubes slide together with ease• A challenging exercise for both sides of your brain• Added bonus: 20 extra premium steel marbles in a ripstop nylon drawstring bag• Marbles are nickel plated steel balls. They are not magnets.