The Rubik's Revenge (also know as the Master Cube) . A six-sided, 4 x 4  cube puzzle with each side printed in solid colour. The object is to twist and turn the cube using various combinations to return it to its original state - every side finally having one solid colour.

However, unlike the 3x3 puzzle, the centre pieces can move in relation to each other, making it even more difficult to solve!!
Over "43 quintillion" possible moves and only "ONE" solution.

Recommended for ages 8 years +