Printable Hard Sudoku

Set 9ih7xd. 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
6 9 7 4 1
3 8
1 2 3 4
8 7 1 9 3 6
3 8 7
7 4 9
6 2 7
3 5
8
Hard #2
9 5
4 5 8 7 9
9 2 6 4
6 5
7 3
3 7 8 4
9 1 8 4
3 8 5
6 5 9
Hard #3
4 8
2
6 5 3 4 9
8 6 2
9 1 4 8
2 4
5 7 6 9 4
3 2 1 6
6 4 5
Hard #4
5 8 1 4 2
9 2 6 3
1 5 9
2 4
3 5
5 4 6 3 9
3 6 2
8 4 3
9 8
Hard #5
6 5
4 2 6 7
3 5 8 4
1 6 9
2 5 8
6 7 3 2
8
9 1 5
5 8 7 4 6
Hard #6
3 7
6 5
2 4 8 1
9 5 2 8
8 3 4
2 9 8 6
4 2 6
8 2 9
3 5 4 7
Hard #7
2 7 3
1 9 2 8
4 8 9
2 5 9 6 3
3 9
9 7 2
3 5 1 7 4
9 4 5
2
Hard #8
2 6 4
1
3 1 9 7
3 7 8
5 6 9
9 4 5
9 6 4
8 7 9 3
7 6 8 5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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