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Ken Ken
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A 3x3x3 stickered with a japanese number riddle.

Inspired by several sudoku cubes the inventor customly stickered a 3x3x3 with a different japanese number riddle. In this case the riddle is Ken Ken where the small black number denotes the result of the sum or product (also denoted in black) of the numbers in equally coloured fields.
Images 3-4 show the first version.



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