Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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