learn Modern Sudoku was popularized by Nikoli in Japan in the 1980s. It has since become a global phenomenon, with daily puzzles appearing in newspapers and onl
The diagonal constraint adds a new layer of complexity that keeps even expert solvers engaged.
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Brain Training
Improve your logical thinking and pattern recognition with this enhanced puzzle format.
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Faster Solutions
Paradoxically, the extra constraint can sometimes make puzzles easier to solve!
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Competition Ready
X-Sudoku appears in world championships. Practice here to compete globally.
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Play Anywhere
Our responsive design works perfectly on desktop, tablet, and mobile devices.
free sudoku medium
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learn History of the Sudoku Puzzle
learn 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 each of the nine 3x3 subgrids contain all of the digits from 1 to 9. impossible sudoku la times Advanced Sudoku solving methods involve complex patterns like X-Wing, Swordfish, and XY-Wing. These techniques are often required for hard and expert level puzzles.
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