Categories of printable sudoku
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Printable Sudoku

When you start a game of Sudoku, some blocks will be pre-filled for you. You cannot change these digits in the course of the game. Each column must contain all of the numbers 1 through 9 and no two numbers in the same column of a Sudoku puzzle can be the same. Each row must contain all of the numbers 1 through 9 and no two numbers in the same row of a Sudoku puzzle can be the same. Each block must contain all of the digits 1 through 9 and no two digits in the same block of a Sudoku puzzle can be the same.

Hints to solution of the printable sudoku N 20

Try to fill the cell a3, e8, f9, g7, h6, d1, c5, b4, a4, g5, f5, i2, e9, b7, d8, f8, i7, i6.

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