Based on the traditional Megaminx, the MF8 Crazy Curvy Megaminx (Black) is a very sophisticated and eye-catching twisty puzzle with a special twist: each face has an integrated circle that, depending on the face, can rotate either alone or in tandem with the outer layer. All rings and outer layers can move freely, resulting in extremely complicated and sophisticated solves. Collectors and seasoned solvers seeking a more challenging puzzle than typical dodecahedral ones love this one because of its curved cut design, vivid sticker colors, and smooth turning.