Printable Hard Sudoku

Set 1sd9u13. 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
9 2 1
6 3 4
7 8 4
9 5
2 8
9 8 5 4 2 7
1 7 3 9
4
3 4 6 2 5
Hard #2
3 5 9 7
6
8 3 9
3 6 2 4 8
2 5 4 3 7
4 6 5
6 3 2
4 7 5
8 7
Hard #3
7 5 1
5 6
6 1 2
9 2 1
5 4 7
3 8 5 4
2 5 1 9 6
5 3 9 2 4 8
Hard #4
9 6 2 8
5 3 1
4 2 9
7 9 8 2
1 6 4
2 3
7 3 9
6 4 7 2
3 1 8
Hard #5
6 7 2
8 5 7 9
7 8 1 4
4 2 3 8
1 7 2 4
4 7
5 9
8 6
4 3 1 6
Hard #6
8 9 2
6 3 7 8
4 6
7 9 1
1 8 4 5
3 6 9
5 3 1 2
7 2 4 5 8
4
Hard #7
5 3 9 8
1 8 6 4
7 1 3
3 7 4 1 2 5
4 2 8
9 3
8 2 4
9 1 8
5
Hard #8
9 8
3 7 6 9 5 2
5 7 2 9 6
6 1
1 9 5 2
3 7 4 1
9 6 8
2 5
3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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