Langer's Sudoku Assistant

Invalid Sudoku!

Column 5 is invalid. Go back and make a different choice.

 

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

 

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