Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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