Langer's Sudoku Assistant

Invalid Sudoku!

Column 3 is invalid. Go back and make a different choice.

 

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

 

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