Printable Hard Sudoku

Set 1a9rvzq. 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 5
8 7 6
3 4 5 8
2 7 9
4 8 2 7 5
9 3 1 4
5 4 1 3
1 2
6 9
Hard #2
2
6 7 2 1
4 9
2 9 6
7 3 5 8 6
3
8 1 9 3 5 6
7 5 1 3 2
5 8
Hard #3
5 3 9
4 3 6 7
5 1
1
8 2 4 7 6
6 9 8 2
7 9 8 5 4
2 6 8
9 3
Hard #4
9 5
6 1 8
3 2 7
5 1 3
2 7 4
1 8 6
7 8 2 5 9
6 2 7
1 3 6 8
Hard #5
5 4 7
1 9 8 5
6 4
2 1 7 8
7 1 9 4 2
2 6
8 3 4 5
8 2 5 9
7
Hard #6
2 4 3 9
9 3
8
4 3
7 8 9 2
8 5 7
3 6 5 2 9
5 7
2 4 9 5 8 3
Hard #7
8 4 2
3 7 1 5 9
5 9 6
5 9 1 6
7 9 2 3
7 5 4
2 4 7
3
6 1 8
Hard #8
6 4 3
2 5
6 7 2 8 5
3 7 6
4 6 5 1
7 6 2 9 3
6 1
5 7 9
9 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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