Langer's Sudoku Assistant

Invalid Sudoku!

Row 6 is invalid. Column 6 is invalid. The middle center 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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