Printable Hard Sudoku

Set 17rwiko. 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
9 7 5 8 3 6
5 8
2
6 4 5 2 8
6 1
5 7
3 5 2 1
1 3 9 6
8 2 7
Hard #2
8 6 5
2 5
7 6 4 9
4 8 5 2
1 8
5 3 9 1 6
1 3 2
5 6 8
6 8 9
Hard #3
8 3 4
5 6 9 2
1 6 4 2 5 7
7 4
6 9 2 8
2 3
4 1 8
5 9
8 3 5
Hard #4
6 2 9
7 6 3
1 5 9
5 6 7
2 9
9 3 6 1
2 8 9 4
9 6 3 7 1
8 6
Hard #5
1 3 6 5
2 1 8 7
4 6 5
2
2 5 1 8 6
4 3 2 1
4 7
9 3 2
8 3 9
Hard #6
5 2
1 2 7 3
4 6 9 7 1
5 1 4 6
1 6 4 9
7 1
8 3
7 2 9
3 7 4
Hard #7
1 3 5 8 7
6 4 5
6 7 9
7 1
3 5 9 8
2 9 7
4 3 2
2 8 6 5
8 3
Hard #8
5 6 3
8 5 7 6
6 9 4
9 1 6
4 6 3 7
4 1
5 1 2 9
8
7 3 9 2 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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