Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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