guides 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 on
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.
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guides What is Sudoku and How to Play?
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guides Common Sudoku Mistakes and How to Avoid Them
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guides Sudoku Strategies: Scanning and Marking
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guides Different Types of Sudoku Variants
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guides History of the Sudoku Puzzle
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guides Basic Sudoku Rules for Beginners
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guides How to Solve Hard Sudoku Puzzles Step by Step
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