Printable Hard Sudoku

Set 3p4qs1. 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
2 1 9 4
9 8 4
1 6 2 3
8 2
3 9 6 8
1 5
8 3 7 1 6
4 1 7 3
5
Hard #2
1 4 6 9 8 3
7
3 6 2
5 1 7
2 8 5
8 6 4
1 9 3 2 6
4 6 1 2
3
Hard #3
3 6
9 7 3 4 8
1
5 6 2
1 7 8
6 2 1
8 3 4
4 2 9 5
7 9 1 4 6
Hard #4
5 3 6 4
5
4 7 8 3 9
8
7 9 3
6 5 2 4
8 1 5 6
7 3 2
9 3 6 1
Hard #5
6 2 4
1 8 7
8 4 9 2
3 6 8
5 4 7
9 1 8
8 1 4 5
1 3 5 8
3 6
Hard #6
3 4 7 5
9 1 7 8
5 6 1 2
6
8 7 9 3
2 7 9
6 1 3
8 4 3 1
5 8
Hard #7
6 5
5 1 7 3
4 3 6 2
2 9 3 1
6 7 2 9 8
1 9 4 2
6 9 7
5 1
2
Hard #8
4
8 9 6
5 3 7 2
5 2 8 3
6 2
7 8 9 1
2 6 5
1 9
5 8 9 3 2 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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