Printable Hard Sudoku

Set 1hrki1k. 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
8 3 6
4 6 5
7 8 4 3
7 6 4 3
9 2 5 7 4
7 8
9 1 6
2 3
4 2 9
Hard #2
7 2 1
3
8 2 4 9
9 2 6 3
6 9
5 8 9
6 3 7 5 8 2
8 3
1 7 8 9
Hard #3
4 7 9 6 3
9 8
9 7 8 5
4 5 2 3
2
9 6
8 7 3
5 1 9
7 1 2 6 4
Hard #4
8 9 1
7 8 3 5
3 4
8 2 5
5 7 6 3
4 7 8 6
2 7 3
1
6 7 5 4 2
Hard #5
9 7 8 3
1 4 5 9
6 5 1 7
4 3
8 6 9
1 4
5 4 3 7
9 7 2
6 4 1
Hard #6
4 6 3 9
3 2
5 1 7
5 3
8 6 7 3 5
9 3 7 8
5 2 4
6 4
8 6 3 7
Hard #7
5 6
7 9 1
8 1 5
3 1 8 7
9 8 3
8 9 4 5
2 9
4 3
6 5 2 9 4 8
Hard #8
2 7 3
4 7 8
8 6
3 7 4
6 8 3
4 8 9 1
7 9
8 5 6 2 9 3
2 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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