Printable Hard Sudoku

Set 27gdlq. 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
8 9 5 3
7 3 6 2
7 6
1 8
2 5 7 3 1
8 2 5
5
4 8
2 6 8 5 4 9
Hard #2
7 6 2
8 3 7
5 9 3
4
6 8 7
4 2 3 6 5
5 9 3 1
1 2
9 7 4 2 5
Hard #3
9 5 2
7 2 3 1
1 7 5
4 1
6 2 9
3 6 9 7
4 1 7 2
7
3 9 5 6 2
Hard #4
1 3
6 1 7 5 3
6
3 1 8 2
1 7 6 3 5
7 4 5 1 9
9 7
4 9 6
2 1
Hard #5
1 5
9 7 2
7 3 4 1
4 7 3 9
2 7 6
2 5 3 8
1 9
7 8
5 8 6 1 7
Hard #6
6 7 2 4 1
3 8
8 9 7 4
9 1 3
2 9 1
2 5 8
4 6 5 1
8 4
1 9 8
Hard #7
1 9 3
8 6 9 5
7 1 4 9 6
1 5 7
8
5 8 4
9 8
2 1
6 8 7 1 4 5
Hard #8
6 8 2 3
5 8 3 6
2 3 4 5
9 3
8 6 3
5 2 8
1 2 4 9
9 1 2
5 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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