Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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