This is a 2x2x2 Mirror Blocks cube, with sides of 60mm (slightly larger than a regular 3x3 Rubik's Cube). It has the same difficulty as the original Mirror Blocks cube, with the added difficulty of a 2x2x2 (no center pieces to use as references). THIS MODEL DOES NOT INCLUDE SPRINGS AND SCREWS. To properly assemble this puzzle, you will need to purchase a Maru Mini 3x3 (30mm) and use its screws and springs.