Langer's Sudoku Assistant

Invalid Sudoku!

Column 5 is invalid. Go back and make a different choice.

 

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

 

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