Langer's Sudoku Assistant

Invalid Sudoku!

Row 4 is invalid. Column 7 is invalid. The middle right 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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