Printable Hard Sudoku

Set dqf9up. 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 1 6 2
3 8 4 9
6 1 7 8
2 6 4
3 7 6
4 3 5
7 3 6 4
5
8 9 2
Hard #2
9 4
4 1 6
4 7 5 1
6 7 2 5
1 3 9 7
9 8
9 5 8 7
3 2 9 1
1 9
Hard #3
2 3 4
6 8 2 7
5 9 8 1
7 1 2
3
6 7
7 4 3 2
3 5 7 6
5 2 8 3
Hard #4
3 2 7 4 5
7 6 2
8 4 3
2 8 9 6 1
9 3 6
1
1 3 9
9 2 8
6 2 5
Hard #5
6 5 4 8
4 8 6 9
5 7 6
9 2 8
3 7 1 2
8
8 3 2 4
2 7 1
8 1 5
Hard #6
7 8 6 1
4 7 9 6
8
6 9 7 3 1 4
1 9 7 6
5
8 2
9 7 5 6 1
3 5
Hard #7
5 3 7
3 1 4 9
2 1
9 2 7 1
8 7 6 4 5
4 5 2
8 1
7 6 2
8 6 3
Hard #8
1 5 9
3 9 7 8
9 8 2
3 2
1 8 6
2 3 7 9 5
6 3 2
1 8 4 6
4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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