Printable Hard Sudoku

Set 13pognf. 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
4 7
7 5 8 1 6
2 3 8
3 2 1
8 6 9
4 7 2
2 5 4 1 9
5 6 7
3 9
Hard #2
8 3 9 5
2 6
5 9 8
8 1 4
7 4 8
2 4 8 6 5
5 6 1 7
5 8 6
2 1
Hard #3
1 3 4
2 4 8
8 1 5
3 6 7
2 1 3
8 9 1 4 2 3
1 5 7 2
9
8 2 3
Hard #4
7 2 6 5
4 8 7 6
4
7 5 4 9 3
9 6 3
2 5 1 6
5
5 2 7 1
9 2 3
Hard #5
8 9 4 1
4 5 8 2 9
7
1 3 5
6
9 8 1 4
3 5 8 4
8 6 1 7
2 5 8
Hard #6
6 5 1 2 3 7 4
8 6
7 1
6 8
4 7
1 3
1 2 7
9 7 4 6 2 3
2 8 9
Hard #7
5
6 2 8 5
5 7 6 3 8
8 7 9 5
9 4 5 1
6 9
5 3 8 2
5 1
1 3 6
Hard #8
8 4 2 3
6
9 3 7 5 8
5 1 3
1 7 8 2
7 4
4 1 6 9
3 9
7 2 6 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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