Printable Hard Sudoku

Set h6sa0b. 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
1 2
3 4
7 3 2 6 4 8
6 3
3 7 9 8
6 2 9
4
3 6 8 1
4 9 2 5 6
Hard #2
8 4 7 3
7 5 4
4 1
6 7
5 9 3 8 1
6 8 2 9 5
4 9
3 9 4
8 2 1
Hard #3
9 7 1
9 5 8 6
5 7 3
4 8 2
4 6 5 1
3 7 4
5 9
8 6 3 9
1 4 2
Hard #4
8 3 7 1
2 5 4 3
6 9
8 3 2 7
4 6 5 1 9
4
6 5
1 4 7 6 2
6 9
Hard #5
6 1
4 5 2 6 8
7 8
7 4
5 9 2
8 3 5 7
2 4 1 9
5 4 8 7
8 5 3
Hard #6
7 8 3
4 9 1
4 2 9 7
5 3 4
3 6
4 1 7
5 1 8 2
3 2 5
9 4 3 8
Hard #7
4 7
3 2 6
6 1 2
1 8
2 8 4 3
8 4 6
3 1 9 7 6 5
5 7 3
4 7 9
Hard #8
3 1 7 5 2 9
2 7 9 3 4
7 4 2 5 6
8 3 4
9 8
4 8 2
1
6 7 3 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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