Printable Hard Sudoku

Set 1hrt316. 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 1 7 4
8 7 2 5
4 7
6 5 2
8 9 4
2 4 5 3
5 3 9
1 8 6 7
3 8
Hard #2
6 8
2 7 1
1 4 7
5 6
5 7 3 1
4 3 2 8
9 5 7 8 4
1 8
7 6 4 2
Hard #3
3 2 4 5 9 6
1 6 8
6 4 7 2
2 8 5
7 3 5
3 1 7
5 6 3 4
7 4 9
Hard #4
1 5 9 6
5 9 2 1
4 7 9 8
5 4 7
7 6 8 2
1 5 8
5 3 6
9 6
2 4
Hard #5
6 2 5 1
3 2 6 1 5
8 3 7
5 8 3 9
4
2 8
1 9 5
4 8 3
3 9 8 7
Hard #6
6 7 2
7 9 5 6
7 1 9 8
3 6 4 9
1 2 5
9 2
3 6 9 7
2 7 8
5 8
Hard #7
9 7 2 4
1 3 8 7 9
5 6
6 1 9 3 4
4 3 6
7 6
9 8
5 9 3
2 1 8
Hard #8
2 5 8
6 5
3 2 4 5
7 1 3 6
3 5 9 2
8 1
4 6 1 3
9 5
7 4 3 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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