Printable Hard Sudoku

Set h3m1li. 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 6 4
4 6 9
9 5 8
1 6 2
6 9
7 8 1 9
2 9
1 9 5 3
9 4 1 3 2
Hard #2
3 7 2 1
4 7
4 5
4 1 8
5 4 9 7
8 6 7 4
3 9 2 6
7 8 1
5 4 3
Hard #3
6 8 2 9
7 2
1 2 3 5
9 5
1 2 9 4
5 8 4 2
4 6 8 5
6
7 3 9 6
Hard #4
1 2 9 8 6
9
4 1
7 5 3 1
2 8 9 6
4 3
9 3 7 2
6 1 4 9
8 5 4
Hard #5
5 3 1 4
3 9 1 7
4 8 6
4
7 2 3 5 1 8
3 9 7 5
4 1
1 7 6
5 8
Hard #6
4 1 7 3
8 9 1
1 9 5 4
4 5
9 3 7 8
1 6 9 4
4 6 9
2
5 7 6 9
Hard #7
1 8 4
8 2 1 6
5 7 3
9
3 4
9 7 1 5 6
8 9 3 4
3 2 9
4 8 1 7
Hard #8
1 4 9 2
5 8 6
8 3 9 1
1 3 9 5 2
5 2 9 7
8 4
7 1 5 6
4 8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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