Printable Hard Sudoku

Set 1u2kzgd. 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
5 2 7
4 6 9
9 1
9 4
5 6 7 2
9 8 2 3 6
3 5 7 2 4
6 7
4 6 1
Hard #2
9 4 5
5 6 8 7
9 5 1
3 1 6
8 9
3 4 5 8
8 7 9 4
2 5 6
6 7 3
Hard #3
4 9 5
7 6 4 2 9
9 2 4 3
5 4
5 3 8
8 1
4 9 1
5 3 6
8 2 4 3
Hard #4
7 1 6
8 9 4
1 7 4
4 3 1 7 8
5 7
1 3
9 7 1 2 4
3 5 9
6 9 5
Hard #5
8 5 2
1 9 7 5
5 2 8 7
3 4 5
1 8 4 3 6
6 7 1 8
4
6 8 2 1
7
Hard #6
5 1 6
2 1 3 8 5
4 7 2 1
5 3
6 3 7
3 9 6 7
7 1 8
9 6 4 3 1
Hard #7
5 3 6
3 8 5
5 2
2 1 6
5 6 7 2 8
4 9 7
4 5 9 1
6 2 4 8 1
8
Hard #8
8 9 7
2 5 4
9 7 1 4 8
4 2 3
4
8 9 1 4 2
8 5 1 6
4 6 1 3
7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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