PlaySudoku.us
Hard · Puzzle #535
2
1
7
8
5
6
4
8
2
5
7
4
6
9
5
2
4
9
7
8
4
6
8
3
5
6
9
3
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.
"We must know. We will know." — David Hilbert
"We must know. We will know." — David Hilbert