PlaySudoku.us
Medium · Puzzle #648
8
3
6
9
2
5
1
7
3
9
1
2
3
1
4
6
5
9
7
6
5
4
7
1
9
8
4
1
6
1
4
7
The Swordfish technique extends X-Wing to three rows and three columns — rare but decisive on expert grids.
The Swordfish technique extends X-Wing to three rows and three columns — rare but decisive on expert grids.
"Anyone who stops learning is old, whether at twenty or eighty." — Henry Ford
"Anyone who stops learning is old, whether at twenty or eighty." — Henry Ford