4x4x4 Cube
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The Rubik's Revenge (also known as the 4x4x4 cube, and normally referred to as the 4x4x4 or 4x4) is a twistable puzzle in the shape of a cube that is cut three times along each of three axes. There are two main brands for this puzzle, both of which are popular for speedcubing: the Rubik's, patented by Peter Sebesteny in 1983, and the East Sheen, patented by Chen Sen Li in 1999.
This puzzle has no fixed centers, but a total of 24 center pieces, a total of 24 edge pieces, and 8 corners. It has 7.4 x 10^45 positions.
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