Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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