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Sudoku puzzle explanation

Sudoku is a diagram of nine by nine boxes in which the numbers from 1 to 9 must be entered. The diagram of 9x9 is again subdivided into a box of 3x3. A number from 1 to 9 must be entered in each box.
In order to solve the puzzle, the boxes must be filled in such a way that in each row, every column and each box of 3x3 the numbers 1 to 9 only occur once.

You do not have to be a clever head, just a little patience and logical reasoning is needed to solve the puzzle.

Sudoku 21 -

4 8 71 6 9 2 53 
2 153 7 8964 
3 69 5 42 7 1 8 
6 5 3 7 2 4 8 9 1
9 2 1 83647 5 
748 95 1 6 3 2
5 3 4 2 97 1 8 6 
87 6 41 35 2 9 
1 92 68 534 7 
First select a number or an edit function (erase for example) and then click in a box of the sudoku.
 
 
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