Langer's Sudoku Assistant

Invalid Sudoku!

Column 4 is invalid. Go back and make a different choice.

 

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

 

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