Printable
Hard printable sudoku
20 sheets of four hard puzzles each, with answer keys. Difficulty is graded by the techniques required, so a "hard" sheet really is harder than a "medium" one.
Start with a sheet
- Sheet 1
- Sheet 2
- Sheet 3
- Sheet 4
- Sheet 5
- Sheet 6
- Sheet 7
- Sheet 8
- Sheet 9
- Sheet 10
- Sheet 11
- Sheet 12
- Sheet 13
- Sheet 14
- Sheet 15
- Sheet 16
- Sheet 17
- Sheet 18
- Sheet 19
- Sheet 20
Tip: print the first sheet, then use the answer key to check — the puzzles are numbered so you can match them up.
Preview
2
5
8
3
7
6
7
9
2
4
3
5
1
2
8
4
4
5
3
9
1
8
1
2
7
Sample hard puzzle. The printed sheets are larger and include four puzzles.