Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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