The Big Book of Sudoku

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For the great amateurs and for those who have not yet discovered this great passion; for the great experts and for those who are taking their first steps, a great soup of numbers... prepared in squares. A grid composed of nine squares, nine rows and nine columns to be completed according to very simple, elementary but immovable rules. Pastime, puzzle, fun... you can approach it as you like, but in the end the result is always the same: no one is satisfied with doing just one. Logic, memory and concentration are essential. Afterwards, those who are looking for new challenges can play trying to improve their speed of response.