Printable Hard Sudoku

Set 1n2oy6q. 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 5
7 9 3 6 5
3 4 7 8 1 9
3 2
4 9 8 5
7
1 9
8 7 4 6
6 5 1
Hard #2
6 1 8 9 5
4 1 7 6
2
9 5 1
4 7
3 8 1
2 6 8
5 8 7 3
2 8 5 4
Hard #3
3
6 4 8 7
4 9 8 3
8 1 2 4 5
4 5 1
7 1 9
7 5 2 6
2 6 3
6 2
Hard #4
6 2 7 9
5 1 3
3 2 6 8 1
1 3 2 7
2 6
5 3 8
9 4 1
8 5
9 8 4
Hard #5
3 7 9 5
5 9 4 8
6 4 2 3
4 3 1
6 9 2 7
8
9 7 1 8 4 6
6 5
6
Hard #6
5 3 8 4
2 1 6 9
8 4 1
1 8
8 2 5
8 1 5 6 4
8 5 9 4
4
2 9 7
Hard #7
5 1 8
8
4 3 6 7 2
6 2 8 3
5 6
4 2 3
9 1 7
6 5 7 9 3
7 9 8
Hard #8
6 7 3 2 8
5 2
8 1 7 5
9 5
1 8 4 3
8 3 7
7 4 5
5 6
1 6 8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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