Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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