Langer's Sudoku Assistant

Invalid Sudoku!

Row 7 is invalid. Column 5 is invalid. The middle center 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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