Printable Hard Sudoku

Set 13ygo9u. 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
6 1 2
5 8 2 1 3
2 7 9
6 4 9 1
2
7 1 6 5
5 8 4 7
9 6
4 2 9
Hard #2
1 7 5
5 6 1 2
5 2 6
1 3 6 4
7
6 4 8 3
9
8 4 1 2 7
5 7 8 4
Hard #3
1 9 4
4 9 2 7
8 1 7 5
7 1 5 4
6 2
2 8 1
2 3
4 2 8
6 4 1 9
Hard #4
6 9 3 7
3
5 8 1
4 6 8
2 7 1 3
1 5 6 4
8 6 1
6 5 9 4
5 2 3
Hard #5
6
9 1 4 2
2 3 5 8
8 5 9 4 7
7 6 4 1
6 3 2
5 2 1 7
9 3
2 7
Hard #6
6
7 8 3 5 2
5 4 9 6 8
2 8 3
5 9
7 6 3 9
3 5 1 8
2 5
9 7 1
Hard #7
5 6 9
5 3 1
6 5
2 7 3 8
7 3 6 4
8 2 9
9 6 1 8
6 2 1
3 4 8
Hard #8
8 1 4 3 2
4 9 8 6
3 7 1
5
6 7 2 8 3
3
7 2 5
8 4 6 5 1
8 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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