Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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