Rubik's Revenge

Rubik's Revenge is the 4x4x4 version of Rubik's Cube. Unlike the original puzzle, it has no fixed facets: the centre facets (four per face) are free to move to different positions. The internal mechanics are rather different: the centre cubelets slide in grooves on an internal ball, which cannot be seen unless the puzle is taken to pieces. The edge and corner cubelets glide on tracks formed by the edges of the centre cubelets in much the same way as in the 3x3x3 version.

Methods for solving the 3x3x3 cube work for the edges and corners of the 4x4x4 cube, as long as one has correctly identified the relative positions of the colours -- since the centre facets can no longer be used for identification.

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