Printable Hard Sudoku

Set ir9yi7. 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
3 6 5
3 4 6
7 1 8 2
8 9 2
9 3
2 7 6 3
8 6 9 5 3
6 2 7
9 8
Hard #2
3 1 2
9 7 8
2 9 4 1
2 4 3 9 5
8 5 6 2
4 6
8 6
4 1
6 4 3 2
Hard #3
3 5 6 9 7
6 3 8
1 7 4 3
9 3 2 7 4
5
6 2 7 3
9 5 8
4 8 6 2
Hard #4
4 7 3
1 3 2
1 7 8
9 1 4
5 6 1 2 3
2 3 8
2 9 7
9 4
3 7 6 9
Hard #5
8 9
3 2
4 3 8 2 7
3 6 8
9 5 4
7 3 9
2 8 4
6 8 4 3 1
3 1 5
Hard #6
1 7 5 6
8
8 5 7 9
9 3 6 4
8 7
6 7 1 5 9 3
2 3
6 5 1
5 7 3
Hard #7
7 5 9 2 3
3
6 9 4
3 4 2
7 8 2
1 8 5 3
5 4 3
1 6 8 9
9 4 8
Hard #8
9 5
6 5 4 1 7
8 4
3 2 9
6 5
5 9 4 2
1 9 3
3 8 6 9
9 6 1 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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