Langer's Sudoku Assistant

Invalid Sudoku!

Row 1 is invalid. Column 4 is invalid. The top center 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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