Printable Hard Sudoku

Set 18e9e9v. 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
1 2 6 4 7
6 9 2
2 4
8 7
2 5
9 2 1 3
8 5 4
5 4 7 3 9
3 2 9
Hard #2
2 3 4
9 4 3
3 8 1 7 2
1 4 9
7 2 5 3
4 8 6
8 3
5 2 1 6
7 5
Hard #3
9 3 1
1 8 5 6 4
6 1 7 5
8 2 7
3
7 5 4 9 3
9 8
5 1 9
7 2 9
Hard #4
8 9
5 1 7
3 9 4 5 7
6 3
5 2 3
3 1 9 8 5
5 7
4 2 6 9
8 7 4
Hard #5
4 8 6
8 9 7
1 9 6
9 1 7 8
6 9 4 2
8 3 1
1 5 7
5 6 8
6 3 1
Hard #6
5 6 7 9
8 7 4 2
1 2 3 7
4
5 1 9
7 6 5 8
2 7
4 9 3 6 7
6 2
Hard #7
9 3
8 7
4 5 9
3 4 1
3 9 8 5
6 1
3 6 5 7 4
4 2 7 1
5 9 6 4
Hard #8
4 7 2
1 4 6
3 7 4 5
2 8 6 4
1 2 8
9 8 1 2
5 2 1
6
6 4 5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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