Printable Hard Sudoku

Set 1ene8ei. 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
7 2 9
3 9
5 8 3 2 7
4 1
9 2 4 6 5
3 2 4
5 6 8 2
8 1 5
9 7
Hard #2
8 6 4 5
5 7
1 2 4 3
9 7 8 5 6 2
5 9 4
4 5
7 2 6 8
9
6 8 9
Hard #3
7 1 9 3
3 2 1
4 8 3
7 5 2 3
2 4 8
1 7 6
9 1 8
5 4
2 8 1 9
Hard #4
1 6
5 3 7
9 4 2 3
8 2 9 3 7
6 4 9
4 9 2 7
7 2 6 8 1
9 5 4
Hard #5
4 8 7 1
1 7 5 9 2
9 6
7 1
7 6 1 3
9 8 4 6
2 5 3 9
7 4
8 2
Hard #6
8 5
3 2 7 6
1 7 6 8 9
6 9 3
7 2 4
1 5
7 9 3 8
9 5 6 4 2
5
Hard #7
5 8
6 4
8 4 3 6 7
8 4 3
1 2
3 6
5 4 9 2
7 9 6 3
4 9 2 7 6
Hard #8
3
9 3 1 8 7
1 2 8 6
5 3 2
1 2 4 5
9 6 1
2 8
9 3 1
8 7 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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