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.
build your own sudoku
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daily How to Solve Hard Sudoku Puzzles Step by Step
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daily To solve a Sudoku puzzle, one must look for cells where only one number is possible, or rows/columns/blocks where a specific number has only one possible placement. how to play killer sudoku Sudoku competitions are held globally, where speed solvers compete to finish complex grids in the shortest time possible.
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daily History of the Sudoku Puzzle
daily Sudoku competitions are held globally, where speed solvers compete to finish complex grids in the shortest time possible. washington times sudoku 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 nine 3x3 subgrids contain all of the digits from 1 to 9. sudoku rules simple The rules of Sudoku are simple but the depth of the game is immense. Every well-posed Sudoku puzzle has a unique solution that can be reached through logical deduction.
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