Printable Hard Sudoku

Set 3pf6ri. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
5 7 4 2
1 8 6 5 7
6 9
6 9
3 8 7
1 5
9 3 5
4 5 7 3
8 3 7 1
Hard #2
5 2 4 8
1 7 2 5 6 3
6 8
6 2 7
3 1 6 8
5 7
4 3 2 7
7 4
3 1
Hard #3
3 8 7
5 9
7 1 2 6 9
3 8 5 6
3 2 1
9 1 6 7
5 3 8
4
4 7 1 2
Hard #4
4 1 7 8
5 1
6 4
7 3 1 2
6 1 5 3
8 9 7 5
8 1 6 9
7 4 3
4 7
Hard #5
5 8 6 7 2
6
2 9 3 5
8 5 3
4 6
2 1
1 8 4 7
9 7 4 8 3
5 6 2
Hard #6
5 3 9
9
8 6 1 2 4
9 1 6 8
2 5
7 8 9 4
8 4 2 6
4 5 2 1
1 8
Hard #7
4 3
6 1 2 9
9 7 2 8
7 2 8
1 9 8 2
4 2
8 3 5 2
4 6 1 9
3 9
Hard #8
1 4 8 6 7 5
5 2
6 4
6 7
4 1 9
3 9 8 6
9 2 5 8 4
7 3
5 1 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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