Printable Hard Sudoku

Set 3829dk. 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
6 5 8
1 8 6 7
4 1
7 2 5
9 4 6
6 1 8 4 9 7
7 2 5 8
5 6 7 1
Hard #2
4 1 6 3 9
4 5 6
7 1
9 3
9 4 5 1 2
7 3 1 4
6 2 3
5 2
9 3 8
Hard #3
9 5
6 1 7 4 8 3
8 5
7 5 2
4 3
9 4 3 8
2 1 7 3
6 8 9 4
7 6
Hard #4
6 7
8 2 9
1 8 7 4
5 2 7
5 4 1
4 9 6
3 4 6
8 7 9
9 1 2 6 4
Hard #5
4 8 2
5 3 9 1
6 5 8
8 5
2 9
3 4 2 6 9
1 5 4
3 7 2
6 9 3 1
Hard #6
7 4 3
7 6 8
6 5 1
2 7 5 6
4 1
3 2 9
8 9 7
5 1 3 7 9
6 9 5
Hard #7
4
7 5 3
8 1 6
4 2 9 8
1 9 2 3
6 5 7
4 6 8 2
3 9
2 6 4 3 8
Hard #8
4 6
7 5
7 3 9 4 2
3 5 9 1
2 8
2 4 5
8 6 5 4 2 1
7 3 6
9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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