Langer's Sudoku Assistant

Invalid Sudoku!

Row 7 is invalid. Column 4 is invalid. The bottom center 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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