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A Sudoku 4x4x4 which uses colors instead of numbers.
Shortly after the game Sudoku became popular the 3x3x3-variants with numbers 1-9 appeared.
The creator of this new variant was displeased with the concept of a 3x3x3-Sudoku and therefore changed two things: First he switched over to a 4x4x4. Second he used colors because he thought that the orientation of the numbers make solving a 3x3x3 sudoku to easy.
The result is a 4x4x4 with 16 different colors. It is known that this variant has several solutions but it is unknown how many are there exactly.
Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann.
This puzzle can be found in collections of these members:
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