Langer's Sudoku Assistant

Invalid Sudoku!

Column 5 is invalid. The middle center 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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