Langer's Sudoku Assistant

Invalid Sudoku!

Column 6 is invalid. The middle center 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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