Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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