Printable Hard Sudoku

Set dwai4v. 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 2 4
4 9 7 1
6 4 5
5 3 8
8 1
9 7 2 5
8 3 9 6 4
8 9 2
1 6
Hard #2
7 4
2 1 9 6
6 9 8 7
7 5 2 3
5 3 4 1
4 3 2
8 1 9 5
1 3 2
4
Hard #3
5 4 1 9
1 8 5
2 6
1 8 2 3
9 7
1 6 4 2
8
3 7 4
6 2 7 4 5 1
Hard #4
3 6 2
8 5 7 3
2 9
4 1 6 7
2 5 3
2 3 9 8 4 5
7 1
6 1 5
8 5
Hard #5
9 2 6 1 3
6
7 4 8 1 5
8 3 2 7
3 4 6
1
2 9 5
5 6 1 3
3 2 4
Hard #6
1 4 5 6
9 3 1
6 7 2 3 4
9 2 7
8 7 6
2 6 5 4
8 1 2
4 3
8 5
Hard #7
4 6 8
7 9 2 5
2 5 1 6
6 7
2 9 8
8 7 6 1
2 7 4 9
5 6 4
5 3
Hard #8
7 8 5 1 6 2 3
9
9 1 3
6 3 5 4
7 2 1 5
5 9
2 7 4
1 2 7 6 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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