Printable Hard Sudoku

Set 1wkd2qh. 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
2 6 8
9 4 3 2
1 3 5 9
8 2 4
5 2 7
3 9 2 5
9 8 5
6 1 4
Hard #2
5
8 9 1 4 3 5 6
4 8 6 2 9
2 5
8 7 1
6 7 4
3 1 2
6 3
1 3 7
Hard #3
9 6
7 1 3 5
3 6 8 1
3 4 7
7
6 4
5 6 3 7 2 9
2 8
9 1 2 5 3
Hard #4
7 3 1
1 4 3 9
6 3 5
2 7
9 8 1
3 5 8 6
5 3 9 4 7
7 4 2
9 1
Hard #5
2 3 7 1
6 3
3 7 5
8 6 2 7 9
7 6 8
9 7
2 4 5 9
9 3 8
7 2 4
Hard #6
6 4 9 2 7
9 8 7 5
3
1 5 9
6 5 7
4 1
4 2 7 8 6
5 7 6 2 1
1
Hard #7
2 6
2 5 7
6 4
3
1 4 6 8
6 7 8 4
8 5 1
2 3 9 1 4 8
4 8 5 3
Hard #8
7 3 1 6
1 4 8
6
1 9 5 3 6
3 1
6 1 2
4 6 2 9 5
3 4 6
8 5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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