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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 30 -

57 2 18 9 6 3 4
84 35 672 9 1 
1 69 3 24 57 8 
4 8 79 56 1 2 3
63 1 248 95 7 
9 2 5 7 1 3 486 
2 5 4 8 71 3 69 
3 1 86 9 57 4 2 
7 96 4 3 2 8 1 5 
First select a number or an edit function (erase for example) and then click in a box of the sudoku.
 
 
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