Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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