PlaySudoku.us
Hard · Puzzle #99
3
7
5
4
9
3
7
5
2
9
1
1
3
7
4
4
2
9
3
8
2
9
6
1
7
6
3
9
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.
"The beginning is the most important part of the work." — Plato
"The beginning is the most important part of the work." — Plato