Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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