Printable Hard Sudoku

Set 16lhefs. 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 7 8 2 4 6
3 9
6 1
6 9 8
7 1 5 6 4
3 9
6 5
4 8 1 7
3 9 7
Hard #2
1 5 6 9
4 5 3
8 4
4 8 7
8 6 4 1 9 5
9 5 8
8 1
6 4 1 7
9 7
Hard #3
5 4 2 8 7
8 6
7 1 2
1 9 3
4 1 5 2 6
7 2 1
6 2 9 8
4
5 6 7
Hard #4
8 9 5
5 1 7 3 6 4
2 7
1 4 6 9 2
4
3 5 4 9 7
6 3
7 9 8
6 7
Hard #5
4
4 7 8 3 9 1
5 8 2
5 3 8
6 9 2 5
7 2 3
3 7 5
5 6 8 4
8 2
Hard #6
9 3 5
2 9 5
3 6 7 2 8
6 2 9
3 4 6 1
9 5 6
4
7 3 9 1
2 6 3
Hard #7
6 2 3 7
3 4
1 2 4
7 1 6
5 1 9 8
6 8 1 4
5 7
8 3
2 3 6 5 1
Hard #8
8 5 7
5 3 2 9
6 3 5
6 8
4 9 1 2
8 1 7 4 6
2 8
7 1 2
9 6 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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