Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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