Langer's Sudoku Assistant

Invalid Sudoku!

Column 4 is invalid. The middle center 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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