Langer's Sudoku Assistant

Invalid Sudoku!

Row 6 is invalid. Column 7 is invalid. The middle left 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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