Langer's Sudoku Assistant

Invalid Sudoku!

Column 2 is invalid. The middle left 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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