Printable Hard Sudoku

Set or7q9k. 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 3 7
8 6
2
9 7 6 3 8
6
7 2 5
1 6 8 4 2
9 5 4 7
4 1 9 3 6
Hard #2
1 3
9 1 7 4 6
3 2
8 7 5
2 1 4 7
1 5 6
8 4
7 6 8 9
3 4 7 2
Hard #3
8 9 5 2 3
4 1 5 7
2 9 1 6
5 6 3
9 8
2 8
6 8 7 5 1
5 3 4 2
Hard #4
6 1
8 4 7 3 9
5
5
1 6 5 8
3 1 9
5 7 8
4 5 2 9 1 3
2 6 8 4
Hard #5
6 3 2 9
8 9 3
7 8 5 3
7 1 2
3 4 6
7 4 6 5
5 6 4
2 9 5 3
2
Hard #6
4 7 8 6
3 8
7 1 3 9
4 9 8 7 2
8 7
6 4
4 6 5
2 3 1
9 8 6 3
Hard #7
8 4 6 3
2 8 6 9
9 8 7
5 2
3 8 6 9
6 4 1 5
8 1 3
2 6
7 5 6
Hard #8
5 3
6 4 7 3 8 2 5
8 3 9 7
8 4 9 2
9
1 6 4
7 3 4
1 8
2 5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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