Langer's Sudoku Assistant

Invalid Sudoku!

Column 9 is invalid. Go back and make a different choice.

 

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

 

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