Printable Hard Sudoku

Set 13npupd. 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 3
3 1 4 8
8 1 2
4 7 8
2 6 5
6 3 4 1
7
1 7 3 2
4 5 2 1 9
Hard #2
1 7 5
3 8
2 5 8 6
6 9 1
9 4 3
3 8 4
1 7 9
8 1 6
5 7 8 2 9
Hard #3
9 1
6 2 1 3 7
7 6
8 7 2 1
1 8 7 2
7 6 5 9
4 8
9 3
7 9 4 5
Hard #4
9 7 8 3 5
6 4 1
5 8 9
5 3 1
5 2 4
8 1 3
3 6 8
9 1 4 7
6 4
Hard #5
1 7 2
2 5 8
4
2 4 1 5 6
3 5 9 8 7
9 3
3 7 5
6 1 4 3
6 7 9
Hard #6
6 4
4 3 8
2 8 9 5 7
8 2 6 5
7
5 7 1
6 4 9
1 3 2 7
7 2 1 5
Hard #7
6 2 4 3
8 1
4 5 2
4 5 7 6
7
9 2 4
1 4 7 9 6
5 3 6 4
8 1 5
Hard #8
3 4 9
3 5
2 7 1 5 8
2 6 5
6 5 8 3
1 3 5 7
2 1 7
5 6 2
9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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