Printable Hard Sudoku

Set hn1x9s. 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 7 1 2 5
1 3 9
2 9
4 5 8 7
8 2 9 6
3 1 5
8 7 6
6 1 3
5 4
Hard #2
7 9
6 2 5 4
1 5 9 7 6
4 2 8
2 1 9 3
6
6 4
9 4 6 7 5
6 8 3
Hard #3
6 2 7 8 1
1 3 2 7
3 6
1 9 2
9 5 2 3 4
8 3
2 6 1
3 7 4 5 6
Hard #4
8 4 6
1 3
6 5
6 2 8
8 6 3 9
8 5 9 4
3 7 2 4
5 9 3 7 1
9 6
Hard #5
9 4
4 2 5 7 9
4 5 2
6 3 5
7 9 5 4
7 9 3
9 6 8
4 8 6 9
7 8
Hard #6
2 1
7 4 2 8
3 1 9 6 7
7 8 4 3 9
9 2
7 3 6 4
2
4 1 8
2 3 5
Hard #7
6 9
9 8 2 7
5 7 8
3
7 4 2 5
1 4 9
4 1 2 7 9 6
2 5 4
9 6 4
Hard #8
3 9
5 4 8
8 5 4 9 2 7
3 9 5
2 4 7
7 6 4
7 8 6 9 5
2 4 6
1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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