Printable Hard Sudoku

Set 1qqok18. 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
7 6
2 8 3 7 9
4 2 5 6
7 9
6 9 5 8 4
5 6
3 9 6 8
4 2
4 5 7
Hard #2
8 7 2
3 1 6
2 8 9
5 2 9
1 5 7
9 8 5
6 1
7 6 9 5
8 1 7 5 3
Hard #3
1 5 9 3
2 9 1 4
5 3
6 7 1
7 5 2
8 3 9 4
5
7 2 1
5 4 7 8 6
Hard #4
7
2 9
4 2 6 3 9 1
9 6 8
4 1 5
2 3 1
5 7 2 3 9 4
5
3 9 6 1
Hard #5
5 3 8 7 1
6 9
3 4 7 8
8 2
8 6 9 3
7 3 6
1 6
5 9
9 6 4 7 5
Hard #6
8 4 5
2 9 4
6 3 8
1 2 4
8 5 6 1 9
9 7
5 3 4
6 2 4 9
4 7 8
Hard #7
7 2 9
9 6
1 6 2 7
9 4 1 5
3 4
7 8
8 4 3 6
3 2
4 1 3 8 7 5
Hard #8
8 6
9 4 1
4 3
6 5 2 9 1
8 6 7
7 9 6 5 2
7 8 2 1 9
5 9 3 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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