Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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