Printable Hard Sudoku

Set 1yys0uh. 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 6
6 7 8
2 9 4
3 2 9 5
2 3 9
4 8 1 6 2
5 2 7
7 3 5
8 7 6
Hard #2
5 9 2 4
3 1
4 2 9
5 1 2 3
1 7 4
4 9 3 8
3 1 7 9
4 6 8
8 2
Hard #3
9 5 3 1 2
8
7 9
4
9 7
2 1 5 4 8
1 6 7 8 5 9
9 5 1 6
1 9 3
Hard #4
9 4 8
7 5 4 2
2 7
1 8 3 2 5
2 9
3 6 7 1
4 3 7 8
1 6 2
6 4
Hard #5
3 4 5 7
5 2 6 9
7 8 9
3 1 5 7 8
6 3 9 5
7 9 5 6
4 7
6 1 3
Hard #6
4 8 2 7 3
6 8 2 9
3 9
7 3 5 9
3 1
5 2 7 6
6 1
4
8 7 3 4 5
Hard #7
7 6
1 6 4 9
9 5 6 3
9 8 1
6 4 3
2 4 7
5 9 3 8
9 1 6
6 5 2
Hard #8
6 2 4
3 2 1 4 6 9 7
4 1
7 3 1
4 9 8 3
8 2 4
8 7 9
8 2
4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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