6 x 6 sudoku Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9x9 grid with digits so that each column, each row, and
The diagonal constraint adds a new layer of complexity that keeps even expert solvers engaged.
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Paradoxically, the extra constraint can sometimes make puzzles easier to solve!
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X-Sudoku appears in world championships. Practice here to compete globally.
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sudoku solver app
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