The 50-piece Q-Ba-Maze 2.0 Starter Pack: Marble Run Maze Building Set from MindWare comes with an assortment of cubes with different exits: bottom exit, side exit, top exit. All it takes is a little imagination and sense of wonder to construct lots of crazy creatures and stupendous structures for marbles to fall, bounce, and roll through and satisfying, look-what-I-built play. The idea book will get kids started but their own intuition will take over in no time. Each Q-Ba-Maze 2.0 Starter Pack comes with 36 cubes in cool blue and green hues, and 14 balls for hours of building and marble run fun. It's a live demonstration of probability, physics and art, all in one! Sorry, the Warm Colors set is no longer available. Ages 5 & up.