CuberSpeed Sudoku 3x3 magic cube Transparent 3x3x3 speed cube clear body with numbers Sudoku Sudoku 3x3 to increase the intelligence of the kids,to release the working pressure of the adults,to help prevent a decline in memory of the elderly.Suitable for beginner and professional player.Enjoy hours of fun with you family and friends Great corner cutting ,Tension adjustable.It doesn't corner twist as often nor does it lock up.Difficult to pop,good control of the cube, comes pre-lubricated and tensioned.Definitely a good choice for you to improve personal record in competitions.This cube can be used for international competitions It is a classic colour-matching puzzle in which the colour shift making it look like a mess, but once you solve it, it magically becomes perfect cube again. Improved Anti-pop Technology and Structure for Extremely Fast and Smooth Cornering No one falls out of love with the 3x3 cubes. Perfect Christmas Gift / Birthday Gift