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Extra Challenge

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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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universal sudoku Sudoku competitions are held globally, where speed solvers compete to finish complex grids in the shortest time possible. naked pairs sudoku 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. sudoku books for adults 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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