Langer's Sudoku Assistant

Invalid Sudoku!

Row 3 is invalid. Column 4 is invalid. The middle center 3x3 Box is invalid. Go back and make a different choice.

 

6
3
7
4
2
       
   5   
      9
1
8
       
   5   
      9
4
2
1
       
   5   
      9
7
8
6
3
6
9
5
8
1
6
3
7
4
2
2
6
8
9
4
3
7
5
1
3
1
7
8
5
2
3
4
9
5
9
4
1  2  3
4  5  6
7  8  9
7
1
2
8
6
8
7
2
3
1
6
5
9
4
1
6
5
7
9
4
2
8
3
4
3
9
8
2
5
6
1
7

 

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