PlaySudoku.us
Evil · Puzzle #351
5
8
2
7
4
2
6
8
9
3
6
3
8
1
5
2
5
6
4
2
6
1
3
5
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 maximum number of givens in a Sudoku that still leaves the rest logically deducible (no trivial completion) can exceed 77.
The maximum number of givens in a Sudoku that still leaves the rest logically deducible (no trivial completion) can exceed 77.