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.
sudoku most difficult
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a Tips for Improving Your Sudoku Speed
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a Tips for Improving Your Sudoku Speed
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a Basic Sudoku Rules for Beginners
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a History of the Sudoku Puzzle
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a Sudoku Strategies: Scanning and Marking
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a Common Sudoku Mistakes and How to Avoid Them
a 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. nytimes sudoku medium Sudoku competitions are held globally, where speed solvers compete to finish complex grids in the shortest time possible.
a Common Sudoku Mistakes and How to Avoid Them
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