Printable Hard Sudoku

Set 1tzroq1. 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 3 2 6
1 7 9 3 5 8
8 5
4 3 6
8
5 4 7 1
2 6 9
1 5
6 2 9 4
Hard #2
4 7
9 4 1 8
6 3
8 5 1 4 6 2 3
7
4 9 1 7 2
6 7 3
4 3 7
5 6
Hard #3
5 2
6 8
9 7 1
3 8 6 7
7 2 5
4 7 2 8
7 2 1 6 5
2 4 7
5 3 7
Hard #4
8 9 2
6 3 7
7 5 8 4
8 5
6 4 7
4 8 3
9 5 2 6 8
1 9 2
2 4 1
Hard #5
2 4 3 5
5 4 7 2 8
8 6 2 5
5 9 2 4
8 9
2 6 3 1
6 3
1 5 6 3
Hard #6
8 4 9
5
4 8 7 2 3
4 9 2 5
6
2 3 5 1 8
1 2 8 3
4 9 6
7 4 5
Hard #7
3 2 5
2 6
5 6 1
8 1 6
7 5 2 9 3
2 1 6
1 2 5 4
3 4 9
8 3 7
Hard #8
7
9 3 1
8 6 5
9 3 8 2
7 5 9 8
1 7 4
6 5
2 5 6
4 1 9 8 3 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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