Printable Hard Sudoku

Set o30lgu. 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 4
4 8 7 9
6 8 7 3
5 8 6
3 2 9 7 4 8 1
3 9 7
9
2 7 4
1 3
Hard #2
3 5 7 9
9 3
8 1 6
4 3 6 2 8
6 2 8 1 5 3 4 7
1
4 1 2
3
6 5
Hard #3
7 5 6 4
8 2 1
6 3 9 1 2
5 1 3
2 4 6
2 1
8 6 3 7
5 6
5 6 8
Hard #4
9 7
3 7 4
4 2 9 5
7 1 9
2 8
3 6 5 2 1
3 7
6 4 1 3
1 2 6 9
Hard #5
6 2 8 7
5 4 6
2 3 8 4
3 4
3 8 2 9
9 1 7
3 4 9
1 3 4 2
6 5
Hard #6
4 3 9 8
6 4 8 7 9
1
5 9 2
2 6 5 4
3 4 8 1 9
2 8
5 6
1 7 3
Hard #7
1 3
5 8 9
4 7 6 5
1 3 9
4 5
6 1 9
9 1 2 7 6
8 5
2 6 1 5 7
Hard #8
6 2 5 9
4 6
3 7 1
5 7
7 4 6 9 3
3 1 8
3 5 9
9 7 5 1
6 1 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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