The ShengShou Crazy 3x3 is based on a standard 3x3 cube but with an added twist (pardon the pun). This shape mod features additional 'circular' cuts on each of the 6 faces. The internal edge pieces on each face will stay put on the face that is turning but the internal edge pieces on each of the adjacent faces will follow its connecting edge piece. Confused? Pick one up and see for yourself, there super fun and a great challenge.