Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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