Printable Hard Sudoku

Set 1xd3elx. 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 9 5
8 4
8 7
9 2 6
8 5 7 3
3 5 2
4 1 3
5 8 7 2 9 6
7 1 8
Hard #2
4 6 9
3 1
9 6 1 3
7 3 6 5
2 6
6 1 9 2 8
5 7 2
3 5
4 2 5 6
Hard #3
4 9 1 3 8
2 1 7
2 4
8 6 4
6 1 8 3
9 4 6 2
7 9 5
8 4 7
6 8
Hard #4
4 2
6 3 4 9
1 6 9 3 8
3 4
4 6 1
8 5 7 6
1 2 9
9 5 2
6 2 1
Hard #5
3 2 7
7 8 5
1 6
3 5
5 2 7 8
4 9 2 1
7 4 9 1
9 8 7
1 8 3 5
Hard #6
9 6 3
7 2 8
1 9 3 5 2
3 9 8 5
7 8 6 4
4 2 9
8 3 1 2
3 4 8
Hard #7
7 8 6 3 4 1
1 6
2 7
9 2 1 3 6
5 9 4
5 3 9
2
6 9 7 4
9 1 7
Hard #8
8 5 3
6 7 8
5 1 6 2
9 6 5 4
1 8 9 6
4 6 7
5 3 4 9
7 2
8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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