Langer's Sudoku Assistant

Invalid Sudoku!

Column 1 is invalid. The middle left 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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