Printable Hard Sudoku

Set pa99gh. 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 4 1
3 2
3 6
5 4 6
4 9
3 9 5 6 1 7
7 1 8 3 9 2
7 5
2 4 8
Hard #2
7 1
2 4 6
6 5 9 3
4 2 9
9 3 7 2
5 1 4
1 7 3
6 4 9
7 2 6 8
Hard #3
2 7 5
4 3
2 6
7 6 2 4
2 9 3 5
1 4 3
5 1 9
6 8 7 5
9 6 2 4
Hard #4
3 6 1 5
8 2 1
4 9
7 2
6 4 8
3 5 9 6
6 5 8 4 7
8 9 1 5
2 3
Hard #5
9 1 3 4
4 2 5 9 3 8
7 4 5 9
8 5 3 1
9 2
6 8 4
1 7 3
6 1 5
Hard #6
9 1 7
5 9 4 8
1 7 5
9 5 8 7 6
6 5
2 3
7 8
1 8 4 7
4 6 8 3
Hard #7
7 6 5
1 9 8 3
8 2 7
2 1 8 7 4
5 6
7 6
1 3 8
2 1 9 3
8 5 6
Hard #8
7 1
9 7 1 8
2 6 9 5
5 1 7
3 1 2
7 2 9 6
4
4 1 9 3
6 3 8 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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