Langer's Sudoku Assistant

Invalid Sudoku!

Row 6 is invalid. Column 4 is invalid. The middle left 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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