Printable Hard Sudoku

Set 13fnft5. 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
3 8 1
9 6 8 2
9 3 4
4 8
7 1 4
5 1 2 6
6 7 3 9
5 2 7
5 2 3
Hard #2
2 1 5 6
9 4 1
8
8 5 7 4
1 3 2
9 6 1
5 7
3 2 1 4 8
8 2 5 3
Hard #3
5 9 6 8
8 5 7 6
2 9
4 5 1 6
7
7 3 2 9 1
6 9
6 3 4 7
9 5 4
Hard #4
7 4 2
6 8 7
5 2 1 9
7 8
8 3 1 9 4
5 4 1
7 2 3 1 9
9
5 2 6
Hard #5
9 8 3 4
4 3 2 1
7 2
8 6 3 1
7 1 9
1
2 8 5 6 1
9 5 7 2
5 2
Hard #6
6 8 3 9 7
8 3 5 1
5 1 2
4 9 8 6 7
8
2 9 8 5
3 8 4 2
1 6 4
Hard #7
8 2
2 9 5
9 1 8 3
2 8 5
6 2
7 3 5 1 4
9 2 6 5
5 4 7 3
6 7
Hard #8
8
8 5 6 1 3
4 5 8 9
7 2 4 8
3 8 9
9 5 7
7 9
9 1 4 6 7
2 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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