Printable Hard Sudoku

Set 5jun7l. 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
7 2 5 6 8
4 8 7
7 2 4
1 7 2 3
5 7
2 9 4
6 1 7 8
5 4 9 7
Hard #2
5 3
8 9
7 3 6 5
5 6 8
1 2
9 2 5 4 7
9 2 1
7 4 6 5
5 7 3 9
Hard #3
8 6 3 4
4 5 1
7 9 6
9 4 2
1 7 6
7 2 3
5 4 3
8 4
6 3 9 2 1
Hard #4
9 2 5 7 1
7 3 6
6 2
6 5
9 2
2 5 8 4
1 8 3 4
8 1
5 1 3 9 6
Hard #5
6 3 9
5 6
3 8 2 1
4 3 6 8
8 7 2
5 2 1 8
4 8
5 7 1 9
9 1 5
Hard #6
5 2
8 2 6 3
3 6 7 5
1 8 7
9 3 1 7
7 8 2 9
5 9
4 3 1
4 5 8
Hard #7
3 1 2 9 7
7
2 4
9 7 4 3 1
5
7 8 1 6
1 8 9 2 5
3 7
5 8 1 6
Hard #8
1 7 4
4 6 5
3 5 2
3 8 5 4
2 6 1 3
4 2
1
5 1 6 8
1 8 6 3 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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