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 easy level
rules Sudoku competitions are held globally, where speed solvers compete to finish complex grids in the shortest time possible.
rules Sudoku Strategies: Scanning and Marking
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rules History of the Sudoku Puzzle
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rules History of the Sudoku Puzzle
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