Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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