who invented sudoku Sudoku competitions are held globally, where speed solvers compete to finish complex grids in the shortest time possible. scientific america
The diagonal constraint adds a new layer of complexity that keeps even expert solvers engaged.
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Improve your logical thinking and pattern recognition with this enhanced puzzle format.
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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 printouts with answers
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