Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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