PlaySudoku.us
Hard · Puzzle #922
7
4
8
5
5
7
8
2
4
3
4
9
5
6
1
7
4
9
7
3
4
2
3
9
1
5
"I think, therefore I am." — René Descartes
"I think, therefore I am." — René Descartes
Box-Line Reduction: if all candidates for a digit in a row or column are within one box, eliminate that digit from the rest of the box.
Box-Line Reduction: if all candidates for a digit in a row or column are within one box, eliminate that digit from the rest of the box.