Printable Hard Sudoku

Set 1pqxnc5. 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
6 3 9
8 3 6 1 2
7 4 8
5 4 2 7
5 8
9 4 1
9 3 7 8
8 6 2 5
6
Hard #2
9 5 8
8 4
2 9 7 3 1
4 9 2 7 6
1 3 8
3 5
7 5 1
1 6 2
2 3 8
Hard #3
2 7
2 4 5 6
6 7 9 8
4 2 8 3 5
3 9
7 1 9
4 1 3 2
3 9 8
8 1
Hard #4
4 1 2 8
6 1 7 4
3 5
9 7
5 2 8 6 1
8 1
7 5 9 6 1 2
7
1 6 9
Hard #5
9 4
7 5 8 9 1
1 5 3 7
9 8 4 1 5
3 1 2
4 9 2
3 9
6 4
2 7 6
Hard #6
7 1 2
3 4 8
5 8 6
1 9 8 7
5 3 6 9 4
9 7
7 5
4
6 5 2 3 9 1
Hard #7
5 2 6
6 1
3 8 6 7
7 2 1 9
8 9 6 7
9 3 6
7 8 2
1 3
3 2 7 4
Hard #8
8 2 5 7
1 2 4
5 6
9 4 7 5 8 1
9 1 7
1 8 2
7 5 4
7 2 6
9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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