How to play Sudoku. Rules and solution methods

A dificuldade do Sudoku depende do número de células inicialmente preenchidas e dos métodos que precisam ser usados para resolvê-lo. Jogar Sudoku regularmente aumenta a capacidade da memória, a clareza mental e reduz o envelhecimento das células cerebrais.

Sudoku solving algorithms - Wikipedia

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Sudoku techniques

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Sudoku Solver - Killer Sudoku Solving Techniques and Tips

Sudoku Solver - Advanced Sudoku Solving Techniques and Tips