Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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