PlaySudoku.us
Hard · Puzzle #274
5
4
6
7
3
4
9
3
7
4
2
5
8
7
3
1
6
8
6
9
4
2
6
8
7
5
1
Try solving a Hard puzzle using only pencil marks — no digit entries until every candidate is mapped out.
Try solving a Hard puzzle using only pencil marks — no digit entries until every candidate is mapped out.
After finishing any puzzle, go back and find every naked pair and hidden single you used. Catalog your techniques.
After finishing any puzzle, go back and find every naked pair and hidden single you used. Catalog your techniques.