Langer's Sudoku Assistant

Invalid Sudoku!

Row 4 is invalid. Column 8 is invalid. The middle center 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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