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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 hard puzzles printable There are several difficulty levels in Sudoku, ranging from easy for beginners to expert for seasoned players. Solving techniques include scanning, cross-hatching, and identifying candidate numbers. sudoku binary The rules of Sudoku are simple but the depth of the game is immense. Every well-posed Sudoku puzzle has a unique solution that can be reached through logical deduction.

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