Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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