Langer's Sudoku Assistant

Invalid Sudoku!

Row 5 is invalid. Column 4 is invalid. The middle center 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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