techniques Modern Sudoku was popularized by Nikoli in Japan in the 1980s. It has since become a global phenomenon, with daily puzzles appearing in newspapers an
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 in japanese
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techniques How to Solve Hard Sudoku Puzzles Step by Step
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techniques Common Sudoku Mistakes and How to Avoid Them
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techniques Different Types of Sudoku Variants
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