a 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
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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a Common Sudoku Mistakes and How to Avoid Them
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a How to Solve Hard Sudoku Puzzles Step by Step
a Many people enjoy solving Sudoku as a relaxing hobby. It provides a sense of accomplishment when a difficult puzzle is finally completed correctly. sudoku expert tips 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.
a Sudoku Strategies: Scanning and Marking
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a The Benefits of Playing Sudoku Daily
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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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