Printable Hard Sudoku

Set 1jh1c7s. 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
8 4
2 1
9 4
9 1 6 5 4
8 5 6 9
5 4 7 1
8 9
7 2 9 3 8 4
7 5
Hard #2
2 7 6 1 4
1 3 8 7
8
7 2 1 5
6 2
3 4 9 5
4 5 8 3
6 9 4
7 5
Hard #3
9 2 8 3 5
5 4
1 8 7
6 3 7 9
8 5
9 3 5 6 8
5 4
1 6 8 2
2 1
Hard #4
7 4 2 9
1 6 3 4
8 6
5 7 8
7 9 1
2 7 1 3
5 7 6
9 7 1 4 5
3
Hard #5
7 9 3 2
1 2 8
3 9 7 4
7 9 6
8 1 3
6 2 3
7 4 5
4 8 3
4 7 1
Hard #6
4 2 3
9 7
2 5 7 8
8 1
4 5 3 7
9 3 6
2 3 4 5
9 1
7 1 2 8 4
Hard #7
3 5 2 6
4 2 7 9 1
7 9 8
6 7 8
6 2 5 3
4 9 6
7 3
7 8 4
9 1
Hard #8
3 6 8
7 4 1 3 9
9 1
9 5 1 4 6 8
7
8 3 5 4 2
7 9 4
5 8
4 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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