The challenge is to construct a square block of numbered cubes, arranged in such a way that every possible row, column and side around the block contains each of the numbers 1 ? 9.
Meanwhile inside the block, every 3?3 section, sliced vertically or horizontally, also consists of the digits 1 ? 9. So pit your wits against the invisible force of the 27 cubes in this ingenious puzzle.
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