Printable Hard Sudoku

Set 1gp36px. 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 6 7
6 8
4 7 6 5 3
3 6 8 2
7 9
9 5 2 1
5 6 9
4 8
7 1 5
Hard #2
3 1 2 6 9
6 5 1
9 3
8 1 2 5
8
5 1 9 4 6
4 7 8 2
7 8
9 4 5
Hard #3
9 7 8
4 3 5 8 1
6 4
3
8 2 9 6
3 7 5 2 1
5 4 2 6
1 8 7
9 1
Hard #4
7 6
6 4 3 8
1 8 5 4
7 6 9
9 3
8 1 7 5
3 2 7 6 5
6
6 4 2 1
Hard #5
2
5 4 9 1 7 3
8 3 1
4 1 9 7
6 3 9
8 5 3 1
3 4 1
8 3 5
7 2
Hard #6
6 5 2
5 7
2 4 8
9 7 2 1
3 7 5 4 2
4 1 6 8
9 5 1
3
7 1 8 9
Hard #7
7 9 3 8
8 4 6 3 2 5
7 4 3 6
2 5
8 9 7
5 2 9 7 6
9 3 1 2 4
Hard #8
2 3 1
7 8 9
7 9 3 2
1 3 2 8
3 9 5
6 1 9 5
3 8
4 1
8 5 3 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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