Each uniquely-shaped block features a silicone number on one side and matching silicone dots on the other. They all combine to create one perfect cube! - But beware... Each shape has to be flipped in just the direction in order for them all to fit together. Get your little learner on the fast track to brilliance with the Smarty Cube 1-2-3. It's a brainteaser that makes early-learning stick!