Printable Hard Sudoku

Set 16qf9fx. 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 5 7
5 6 2 9 4
4 7 3 5 8
9 5 2 3
1
3 9 7
1 6 5
6 3
4 7 9
Hard #2
8
7 8 1
4 6
8 2 7 6 9
5 9 8 4 3
7 8
4 6 7
2 5
6 7 8 1 4 3
Hard #3
9 8 6 4
8 5
6 2 7
7 2 3
8 9 7
7 4 2 6
8 6 4
4 8 1
5 7 2 6
Hard #4
7 3 6
6 5
5 1 8
2 5
8 9 4 1
1 5 2 4
8 2 5
3 8 7 6 9
5 6 2
Hard #5
5 3
6
2 9 5 1 7 8
4 9 3
1 3 6
1 2 4
7 8 9 2
9 2
3 8 2 5 6
Hard #6
6 7 4 3
6 4 7 8 2
8 9
5 1 8
4 9 8
1 2 3
9 8 6 2 4
8 1
5 6
Hard #7
8
7 1 9 5
4 9 2 6
3 9 4 8
2 5 6 7 1
8 3
1 7 4 2 6
2 7
8 3
Hard #8
9 2
5 2
9 8 4 1
9 2
5 7 3 1
1 3 6 9
5 9 3 4
7 6 3
9 2 7 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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