Printable Hard Sudoku

Set r5od5v. 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 6 9
3 5 8 2
8 7 1 4
4 5 3
8 6 3 2 7 4
2
6 8 9
1 8 5
1 2
Hard #2
1 7 3
6 1 3 8 2
9 4 6
3 8 5
5 1 3
8 7 4 1
2 6
5 2 9 7
5 3
Hard #3
3 7 2
3 6 9
9 2 6 7
6 1 7 3 8
4 5 6
3 9 7 4
8 5
5 4 1
4 2
Hard #4
2 7 3 5
4 3 1 9
6 8 4
8 6 3
2 7 1
6 2
5 7 9 3 2
9 5 8
3 1
Hard #5
1 8 7 5
2 9 3
6 8 1
5
8 1
4 9 2 3 5 7
4 3
8 5 9 6 2
7 3 8
Hard #6
3 1 5 7
5 6 2
2 6 7 3
6 5
9 3 1 2
6 4
7 6 5
1 7 9
5 4 2 8
Hard #7
7 2
5 4 6
6 5 3 9
4 1 8 3
6 1 3 2
7 2 5
7 3 4
2 5
9 4 1 8
Hard #8
9 2 4 1 8
1 9 8 3
4 2 7
3 6 9
5
8 7 5 4
4 5 3 7
3 6 4 1
9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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