Sudoku number 23

Difficulty:

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.

53 8 2 6 97 4 1 
2 6 45 1 79 38 
7 1 9 8 43 25 6
825 7 3 14 69 
9 4 36 5 2 18 7 
6 71 98 4 5 23
18 74 26 3 9 5 
4 96 37 5 81 2 
3 5 2 19 8 6 7 4

First select a number or an edit function (erase for example) and then click in a box of the sudoku.
 
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