Stretch your brain and keep your mind young with the challenging Clueless Sudoku puzzles.
Clueless Sudoku is an addictive Sudoku variant, it has 9 separate Sudoku grids (not overlapping), with a tenth grid formed from the central 3x3 boxes of the other nine grids. It is called, "Clueless" as there are never any given numbers in those central boxes. Of course, all Sudoku rules apply to the tenth grid as no repetition in rows...
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