Printable Hard Sudoku

Set 5i6u5v. 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 8
5 2 7 9
3 6 9 2
3 2 8 4
4 2 1 6
3 4
8
2 6 7
7 8 1 5 4
Hard #2
6 1
8 4 5 1 7
4 5 2 9
4 9 2
3 7 9 1
1 6 7
2
5 8 4 9
7 4 9
Hard #3
8
1 2
6 7 4 8 5 1
8 3 9 7 5
5 2 1 9
7 8 4 1
8 9 5
7
4 3 8
Hard #4
6 9 1
1 8 5 3
7 2
3 8 7 6
8 9 3 5
1 6 2 3 4
3 6 8
4 9 3 5
Hard #5
6 7
8 7
9 5 2 8
9 8 1 3 7 4 5
4 7 8
2 3
8 4 3
7 1 3 2
5 1
Hard #6
5 7 4 2
3 2 6 1
1 4 3
5 9 6
8 6 3
9 8
4 9 7 3 5 8
7 2
6 8
Hard #7
3 5
6 8 5
7 2 6 9
1 2 9 8
3 6 5
9 8
8 7 9 2 3
2 4
5 4 1 9
Hard #8
2 8
7 2 4 5
5 9 7 4
9 5 8
8 3 9 6 5 7
2 7 8 9 1
4 8 1
8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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