Composed of 216 individual high-energy rare-earth magnets, the NeoCube allows you to create and recreate an nearly infinite number of shapes and patterns. Can be used to create complex designs and puzzles, or for simple fun and relaxtion. As of 1.06.2011 this product had 4 out of 5 stars from 84 reviews on Amazon.com and was No. 2 on the top 100 bestselling toys and games. PROS: Challenging; stimulates both brain hemispheres; many variations. CONS: Not suitable for children under 14; can be difficult to master.