Printable Hard Sudoku

Set 1r16q9n. 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
7 8 3 6
6 2 4
8 4 3
1 9 7
4 6 8
7 8 4 3
2 9 1 8
9
2 3 7 5
Hard #2
4 1 7 2
7 8 9 6
9 1 8 5
8
8 3 9
7 4 2 8
5 3 4
6 2 3
2 5 1
Hard #3
2 3 8
5
8 3 7 4
4 5
3 1 6
9 4 8 1
3 1 8 5 7
5 4 2 3
2 9 7
Hard #4
8 2 6
5 9 2
1 3 4 5
5 8 9
5 2
2 6 1 5
7 3
3 7 6 9
4 6 2 1
Hard #5
9 4 3
7 3 6 1
4 7 5
3 5 9 4
2 3
6 2 7 1
1 6 8 5
3 1 6
9 7
Hard #6
3 5 1
4
6 9 7 4
4 3 7
8 9 5 1
9 5 8
2 3 9 7 4 1
8 5
5 6 9
Hard #7
1 6 7
7 2
6 5 9
8 1 5 4
9 3 5
4 3
1 9 2 4 5
2 4 6
7 3 8 9
Hard #8
3 4 2 1
8 3 2 4
1 7 8
4 3
9 6 7
7 8 6
4 9 3
5 3 6 7 4
8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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