Printable Hard Sudoku

Set 309086. 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
5 7
3 2 8
4 1 8 5
2 8
7 9 5 2
9 6 7 4
7 9 1 5 2
1 8
4 3 2
Hard #2
5 4 8 3
9 5
4 3 9
7 6 5 1
3 7
1 6 4
6 8 2
2 4 1 3
8 6 2 7
Hard #3
3 5
7 1
1 3 2 8 9
1 6 4
7 4 1 2
9 6 5
7 2 9 1 3
9 3
2 6 7
Hard #4
8 1 5 9
3 8 2
5 4
5 7 2
2 8 6 3
4 1 2 6
2 4 5
7 8 5 2 9 1
Hard #5
2 3
1 5 7 8 6
6 3 2
7 3 8 5 4
2 8 4
9 1
7 1 4
4 3 5
6 5 9
Hard #6
4 6 9 3 7 2 5
5 7 8
2 3
2 5 8 4
4 1 3 7
1
6 8 7
4 8
9 1 3
Hard #7
2 8
4 8 6 3
8 9 5 1 6
2
1 3 2 5
7 5 6
7 4 3 2
5 7 9 3
1 5
Hard #8
1 8 4
3 2 6 5
4 3 2 1
6 5 8 3 4
8 6 5
2 4 7
5
4 1 9
8 6 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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