Printable Hard Sudoku

Set 1dgdqx1. 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
1 8 7 9 5
6 1 4
5 8 6 4 2
8
3 7 1
1 6 2 7
8 1
6 2 8
7 9 5
Hard #2
6 4
1 9 6 5
8 3
3 9 5 4
5 3 4 7
8 3
7 5 1
9 4 7 1 2
1 3 6
Hard #3
3 1 4 8
5 6 3
3 6 5
5 6 1 8 7
4 9
1 2
9
5 8 7 1 2
4 6 3 5
Hard #4
7 2 4 8
1 7 2
3 6 9
8 7 9 6
6 4 5 2 8
2 4
4 6
3 4 9
3 9 4
Hard #5
2 6 3 8
1 8 2
3 5
8 3 6 2
2 7 5 4 9
9 1
1 7
5 9 4 3
6 1 5
Hard #6
8 2 4 7
1 3 7
6 2
3 7
2 4 3 6 9 8
8 9 5
6 8 7 2
1 4
4 7 1
Hard #7
5 2 9 7
4 3 7
2 1
9 3 2
5 8
1 4 8
2 6 3
9 2 6 5
6 8 9 3 1
Hard #8
3
7 8 4
1 2 6 8
4 9 5 6
3 9 7 4
7 2 1
6 1 7
8 4 1 9 3
5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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