Printable Hard Sudoku

Set 15bywnt. 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
9 8 2
6 3 1 4
4 2 6 7
4 8 1
3 9 7
7 2 5 4
2 4 3 6
8 4 2
9
Hard #2
7 9 2 8 5
8 5 9 6
6 4
3 9
8 1 2
6
9 7 1
2 1 4 8 9
6 3 1 4
Hard #3
3 4 8 7 2
7 9 6 2 1
2 4
6 5
9 7 2
4 1 9 6
9 2 8
8 7
5 8 3
Hard #4
1 3
4 7 8 5
1 4 2
1 7 9 3
8 3 1 5
7 6 8 5
6 2 9 3
9 3 1 4
Hard #5
7 4 2 5
8 4 5
6 5 9 1
4 3
9 6
8 3 5 7 1
6 7 5 1
7 9
2 8 5
Hard #6
3 6 5 2 4 1
4 9 6
1 9 3
5 7
5 2 6 3 8
4 7 1
4
2 1 9
1 2 4
Hard #7
7 6 8 3 5
8 9
6 3 8 1
8 4 2
1 4 2 5 7
6 9 1
7 1 2
6
7 1 5
Hard #8
2 5
4 5 9 1
2 7 3
2 8 7 6
3 5 9
9 8 3
8 2 6
7 6 9 3
5 1 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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