Printable Hard Sudoku

Set 12ipe5o. 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 1
5 4 9 3
2 8 6
3 9 1 5
2 5
8 7 4 6
5 8 4
6 1 5 9
3 9 7
Hard #2
8 1 5 4
9 6
6 9 4 1
4 9 2
6 1 7
7 5 4
3 1 8 4 2
7
5 7 1 8
Hard #3
4 9
6 7 2
2 8
1 3 8
7 2 6 5 3 1
5 2
9 2 1
4 6
6 7 3 5 4 2
Hard #4
7 6 5
6 8 4
3 8 7
5 9
4 7 9 1
1 5 8 2
2 6 5
7 3 1
3 1 9 7
Hard #5
7 8 2
5 9 3
1 2 4
5 4
9 1 5 3
3 4 9 6
8 6 3 9
3 9
2 5 8 7
Hard #6
9 3 2
7 4
4 5 9
6 7
8 2 3 1
3 9 8 2
8 4 9 1
5 9 8 7
1 2 5
Hard #7
4 5 2 9 1
7
9 8 7
9 4 3 1 8
1 5
5 9 7 2
4 2
3 1 8 4
7 6 5
Hard #8
7 6 9
9 2 3 8 4
6 8 4 2
6 8 1 5
1 5 7
2 3
4 9 1
5 2
4 6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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