Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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