Printable Hard Sudoku

Set 18m9w1n. 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 8
4 8 3 1 5
6
3 4 1 7
2 6 8 1
8 2 4
7 8 9
6 2 7
8 3 5 1
Hard #2
1
6 5 8 3 4
2 9 8
5 8 2 1 3
6 3 9 4
7 1 8 6
4 5 2
5 6 3
4
Hard #3
6 2 8 1
3 2 7
7 3 9
8 4
3 1 5
4 5 6
1 9 7
4 1 2 9
7 8 5 6
Hard #4
2 1 3
9 6 2 7 1 4
5 4 6
5 6 4
7 2
4 1 3 9
1 7 2 8
3 8
6 9
Hard #5
3 5 4 8
5 2 6
7 9 2
1 2 5
3 8 5 9
4 8 1
7 1 9 8
5 9 1 8
7
Hard #6
7 3 1 8
6 3 7 4
8 5
9 1 6
6 8 3 7
4 8
1 2 5
4 6 8
9 7 6 3
Hard #7
1 2 9
6 3 1 8
5 9 4 6 7 3
7 2 4
3 2 5
4 5 8
1 8 4 5
9
7 4
Hard #8
6
4 9 6 1
2 3 8 5
4 7 1
1 4 8
6 9
3 2 6 8 5
9 5 7 4 3 1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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