Langer's Sudoku Assistant

Invalid Sudoku!

Row 4 is invalid. Column 6 is invalid. The middle center 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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