Printable Hard Sudoku

Set 1dpyf3d. 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
2 7
8 6 3 1
4 7 6 5 3
9 3 4
3 8 2 6
4 2 8
1 8 6
9 6 2
9 5
Hard #2
4 7 2 8 3
6 9 7 1
7 6
5 1 2 3 8
2 9 8 5
3 6
4 3 9
8
9 8 5
Hard #3
1 6 9
3 6 4
9 6 4 1
9 3 7
5 4 1 6
2
8 1 2 9 5
5 1
7 1 9 6
Hard #4
9 1 3
7 6 5 2 4
1 4 8 6
9 5 7
1 4 5
8 9
3 2 1 7 8
9 8 6 2
Hard #5
1 3
4 1 2
9 2 6 7
1 5
3 4 2 8
6 3 4
1 4 2 5 6
7 6 2
5 1 9
Hard #6
5 4
4 8 7
6 9
9 7 8 1
6 3 5 1 2
4 2 9
7 3 9
6 7 8
3 9 6 8
Hard #7
9 4 5 3
8 1 9 5
6 7
7 3 2 4
4 7
4 1 2 6
8 3 5 2 1 9
5
3 1
Hard #8
7 8 1
1 7 2
4 5 3
5 8 9
7 6 4
9 7 8 3
1 5 2
9 2 3 5
6 8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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