Printable Hard Sudoku

Set 1hrr8aw. 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
6
7 8 5 4 3
3 8 2
9 3 4 2 7 8
1 2 6
8 4
2 7
5 4 1 9 7
8 5
Hard #2
5 1
2
9 8 4 1 3 5 2
8 7
5 3 6 9 4
1 4 3 7
3 4
4 8 2 3
9 8
Hard #3
8 9 4
1 2 6 4
7 1 3
3 2 8 9 6
6 2 1 9
8 7 1
5 9
3 9 1 6 7
Hard #4
3 6 7 2 4 5
7 3
4 9 3
6
5 9 6 3
6 7 9 8 1
6 3 7
8 2
4 8 3
Hard #5
8 3 9
4 5
2 3 8
5 2
5 6 4 9
5 1 7
5 2 3
8 9 4 2 1
1 3 2 6
Hard #6
9 8 3 6
5 3 2 9 7
8 9
9 7 6 4
2 8 3
6 8 5
7 4 1 2
5 6
6 5
Hard #7
8 4 1
4 7 9
6 9
9 3
4 7 3 1 8
8 5 1
2 1 8 7
4 6 3 8
1 6 2
Hard #8
3 5 2 6 4 1
8 7 6 3 4
9 5
3 8 4
9 3
1 2
3 7
4 2 6
1 5 4 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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