Printable Hard Sudoku

Set 1xhhku0. 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
5 9 7 1 4
2 6 4 9 5
1
9 4 1 6
3 2
5 9 3
3 6 4 5
8 4
2 7 9
Hard #2
2 6 9 5
4
4 7 9 1 6 2
5 8 6 7 9
5 3
2 1 8
9 6 2
5 9 1
3 4
Hard #3
1 9 4 2
7 8 1
7 2 5 1
9 8 3 4
1
4 1 2
5 3 6
6 2
7 2 3 1 5
Hard #4
1 4
6 4 9 2
9 2 5
1 6 2 7
4 5
5 8 6 3
9 8 5
1 3
3 1 9 6 8
Hard #5
4 5 1
7 9 6 5
1 2 7
1 9 2
5 4 1
2 3 4
8 6 1 2 3
3 2 6
1 8
Hard #6
8 2
9 3
1 2 7 6
8 5
5 1 3
4 8 5 7 6
1 9 8 7
7 8 5
3 7 9 4
Hard #7
8 9
4 8 6 5
8 7 4 3
8 2 6
7 9
6 8 2 5
7 1 4
6 3
5 7 9 2 3
Hard #8
9 4 5
7 5 2 6 4
3 7
2 7
1 2 6 9
9 8 4 6
1 2
1 6 9
5 8 4 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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