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mini sudoku 4x4 Modern Sudoku was popularized by Nikoli in Japan in the 1980s. It has since become a global phenomenon, with daily puzzles appearing in newspape

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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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