PlaySudoku.us
Hard · Puzzle #627
6
9
7
8
6
2
8
4
1
6
5
1
4
4
6
3
1
2
9
5
3
9
8
7
6
1
2
8
4
"Mathematics takes us into the region of absolute necessity, to which not only the actual world, but every possible world, must conform." — Bertrand Russell
"Mathematics takes us into the region of absolute necessity, to which not only the actual world, but every possible world, must conform." — Bertrand Russell
When a row, column, and box all intersect, the intersection cell is the most constrained — always check it first.
When a row, column, and box all intersect, the intersection cell is the most constrained — always check it first.