Printable Hard Sudoku

Set 1h3gec0. 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 4
2 6 7
6 9 8 2
4 5 2 1
7 8 9 3
2 3 4 9 7
8
5 1
6 7 5 1
Hard #2
2 7
7 8 2 1
9 6 3 4
9 4 5 8
6 4 7 2
5 7 1 9
4
8 9
3 2 5 8
Hard #3
7 8 1
1 4 3
6 3 7 9
3 6
8 9
1 4 5
3 6 8 9 7
5 7 9 6
1 7 8
Hard #4
3 8 9 4
9 4 3 1 5
4 9 3
1 4 2 7
5 6
7 8 9 2
5 2
3
3 2 8 6
Hard #5
7 6 4 9
9 5
1
1 5 7 9 6
8 6 1 5
4 5 8 3
1 2 4
6 3 8
7 3 5
Hard #6
6 7 4 8
4 9 6
2 4 9
7 1
2 3 9 1 5
9 6
8 3 2
5 6 1
3 5 7 6
Hard #7
5 7 9 6
4 8 3
6
7 1 9
6 9 3 8 5
1 8 4
9 7 4
5 1 9
1 9 3 7
Hard #8
2 5 1 7
4 3 9
4 2 5
1 6 7 4 2
7 4 8
8 1
5
9 5 2 6
9 7 2 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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