Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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