Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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