Langer's Sudoku Assistant

Invalid Sudoku!

Row 5 is invalid. Column 4 is invalid. The middle center 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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