Printable Hard Sudoku

Set 1lhhl7u. 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 7 1 4 6
3
3 6 2
8 3 6 1
6 2 1 8
3 4 8 6
9 1 3 5
6 8
7 2
Hard #2
5 3 4
6 2 1
8 7
7 2 5 4
6 8 5
5 9 3 7
6 4 1
5 2
4 7 8 2 9
Hard #3
9 6 1 2
5 3
8 9 6
6 5 2 8
5 2 4
4 8 7
4 9 3
4 3 6 1
6 1 8
Hard #4
1
5 4 9 6 3 7
3 7 4 6
7 5 4
6
2 9 8 4
4 3
6 9 1
9 8 2 7 3
Hard #5
2 1 5 7
6 4 9 5
5 1 8
8 6 7 4 2
9 4 1
1 6 5
5 6 2
1 3 6
9
Hard #6
7 9 8
2 8 4
5 6
9 1 2
7 5 3 1
2 6
1 3 6
5 2 1 4
8 2 9 1 3
Hard #7
6 7 8 1 4
6 7 8
8 5 3
9
5 3 6 9
1 4
8 5
5 2 1 6
1 4 6 9 7
Hard #8
6
4 8 6
3 6 4 9 5
1 3 8 5
8 9 7
6 5 2
7 2
4 9 1
9 2 1 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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