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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X-Sudoku appears in world championships. Practice here to compete globally.
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sudoku with answers printable
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a Sudoku Strategies: Scanning and Marking
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a How to Solve Hard Sudoku Puzzles Step by Step
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a Common Sudoku Mistakes and How to Avoid Them
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a Different Types of Sudoku Variants
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a Different Types of Sudoku Variants
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a History of the Sudoku Puzzle
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a History of the Sudoku Puzzle
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