Printable Hard Sudoku

Set 1s6xydh. 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
2 4
6 2 4
5 6 1
6 8 2 3 1 9 5
4 2 8 3
5
7 3 9 2
5 3 8
4 1
Hard #2
4 6 7 1
6 5
1 7 8
9 8 4
8 5 3 1 4 6
6 5
8 9 2
2 3
5 3 9 4
Hard #3
5
2 7 4 6 5
3 1 7
2 9 3 1
3 5 1 4 2
6 8 5
1 6
5
9 7 8 4 3
Hard #4
4 3
8 7
9 7 8 1
4 1 3 2
8 5 6 3 7
7 1
2 4 1 6 7 8
7 3
2 1
Hard #5
6 1
9 2 4 5
5 1 3 7
4 8 1 2
8 6
5 7 1 9 4
1 5 4 6 3
9 7 2
Hard #6
2 9 8
6 3 9
9 1 6
7 5 8
2 6 3
3 7 9 8 6
9 2 4
5 6 4
8 6 7
Hard #7
2
3 6 4
9 1 5 3 2
7 9
4 6 8
7 6 4 5
2 7 1 9 3
5 1 7
4 5 8
Hard #8
1 2 5
2 9 7 3 1
5 8 9
1 2 9 7 5
5 2
3 8
7 3
5 1 2
9 1 8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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