Sudokube
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Sudokube is a variation on a Rubik's Cube in which each face resembles one-ninth of a Sudoku grid: the numbers from one to nine. This makes solving the cube slightly more difficult than a conventional Rubik's Cube because each number must be in the right place and the centre cubies must also be in the correct orientation. The other cubies will be aligned once they are in their correct position as if it were a common Rubik's cube. In fact, the alignment information by itself is almost enough to solve the cube; the numbers could be replaced by arrows and the puzzle would be almost identical except for a few edge cubies that would be ambiguous with arrows instead of numbers. It is available in 3×3×3 and 4×4×4 sizes. A buyer of a sudokube should note that a sudokube is not a rubik's cube with numbers written on it. If it is colored in a way where the cube can be done just by looking at the numbers, it is not a sudokube.