Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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