Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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