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.
printable blank sudoku grids
learn Sudoku competitions are held globally, where speed solvers compete to finish complex grids in the shortest time possible.
learn History of the Sudoku Puzzle
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learn Sudoku Strategies: Scanning and Marking
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learn Basic Sudoku Rules for Beginners
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learn How to Solve Hard Sudoku Puzzles Step by Step
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learn Common Sudoku Mistakes and How to Avoid Them
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learn Different Types of Sudoku Variants
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