Langer's Sudoku Assistant

Invalid Sudoku!

Row 4 is invalid. Column 2 is invalid. The middle left 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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