Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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