Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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