Printable Hard Sudoku

Set 6rbn8k. 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 1 2 7
4 5
2 4 1
3 8 2 4
6 1 3 9 8
9
1 3 5 2 8
5 4 1 2
6
Hard #2
3 5 7 8
4 8 3
9 6 1
6 4 8
4 5
5 2 3 4 9
2 3 1 5 6
9 1 3
5
Hard #3
5 8 4 9
8 5 4 7
9 3
9 2 6
2 1 4 8
7 3 4 2
2 1
5 7 2 8
9 1
Hard #4
2 1
2 6 8 4 3 5
3 8 7
7 2
8 5 3 6 4
9 7 5
5 6 1
3 9
3 2 4
Hard #5
3 6
4 2 7
8 7 4 5 1
4 8 2 1
3 2 9
6 4 8
3 7 8
7 1 3
6 4 7
Hard #6
3 9 7
4 9 8
1
5 6 9 7 4
4 9 1 8 6
2 3 6
1 4 7 3 8
8 3 2 4
Hard #7
2 7
3 4 8 6
8 2 7 9
2 8 1
3 7 6 9
6 9 4 1 3
6
8 3
4 7 5 2
Hard #8
2 3 6
3 1
5 1 2 4 9
7 4 1
2 8 9 6
4 9 5 1
2 5 8
4 9
8 1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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