Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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