The Q-BA-MAZE 2.0 Rails Builder Set includes cubes that keep you guessing and rails that go the distance to 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?" Q-BA-MAZE 2.0: Rails Builder Set includes 40 single-exit cubes, 20 bottom-exit cubes, 20 double-exit cubes, 10 straight-away rails, 4 marble catchers and 10 marbles.