Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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