Printable Hard Sudoku

Set h1cwk9. 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
8
2 6 7 8 5
1 4
6 5 9 1 3 2 4 8
7 5 2
2 9
8 4 1
7 9 6
3 7
Hard #2
7 8 1
3 9
3 7 1
8 4 5 2
2 1 9 8
1 2 8 6
8 1 3
7 3 5
5 9 1
Hard #3
3 7 5 9
1 5 3 8 6
7 2 4
8 2 6
3
9 2 3 8
9 2 7
5 3 8
8 9 4
Hard #4
7 2 5 3
9 3 6
4 9
2 8 4 7 1
7 1
1 6 8
7 9 6 3
3 1 5
6 4 9
Hard #5
5
4 3 1 9 2
6 8 7 4 3 1
9
3 6 8 2
8 4 7
5 1 8 4
7 2
8 6 3
Hard #6
9 3
2 7 1
3 5 8
6 2 4 1
9 7
8 1 9
6 7 9 8
5 4 1 3
8 3 4 2
Hard #7
4 3 1 7 9 5
5 4 8
2 6 8
7 1 3 2
3 4
1 6 4
1 5 2
6 7
2 6 8
Hard #8
3 7
2 9 4
6 4 8 9
6 9 3 8 1 5
3
4 8 1
5 9 1 6 3
9 4
5 6 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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