Printable Hard Sudoku

Set 1a3pg6a. 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
1 4 8
7 8 2 5
2 5 9
9 4 7 5
5 6 2
5 6 8
1 4 5 2 7
3 7 4 1
Hard #2
3 1 4 8
5 7 2 9
8 7
1 7
9 6 8 7
9 3 6 5
8 9 7 2
9 4 1
4 6
Hard #3
8 6
1 6 2 5 3
6 2 5 9
6 2 8
1 7
2 5
5 8 1
6 3 2 9
2 7 3 4
Hard #4
8 9 1 5
5 1 3
3 9 1
5 4 2 8 6
6 8 2
2 4 6 3 5 1
7 6
2
6 3
Hard #5
5 6 1
2 1 3
6 3
1 3 9 7 8
6 5
4 7 9 2
8 7 2 3 1
3 8
5 4 7
Hard #6
1 2
2 3 4
4 9 6 3
8 9 7
2 3 5
6 5 7 3 8
9 7 4 2
6 4
5 7 1
Hard #7
6 7 3
9 5 8
6 5 9
8 7
9 6 1
3 9 5 8 6 4
1 2
4 1 5 7
9 4 8
Hard #8
4 8 2 6 9
7
9 7 4
9 1 2 6 8
7 4 9 5
3
8 6 2
4 5 8
5 3 6 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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