Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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