Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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