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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 puzzle creator To solve a Sudoku puzzle, one must look for cells where only one number is possible, or rows/columns/blocks where a specific number has only one possible placement.

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