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

 

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