Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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