Printable Hard Sudoku

Set 1toax0. 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 6 1
4
1 9 2 8 7
3 8 1 9
4 3 2
2 7
7 5 8
8 3 5 6
4 6 5 9
Hard #2
4 5 1 8
7 4 2
2 6 5 3
3 2 6 9 5 1
8 3
4 9 7
7 5
8 2
3 2 9
Hard #3
4 9
2 5 9 3
6 8 7 4
2 9 7
5 1 2
6 4 9
5 7
5 8 2 6
3 8 1 9
Hard #4
6 4 9
9 4 3 6 1
5
1 7 4
7 4 5 9 1
8 9 5
8 5 4 6
1 7 8
2 7
Hard #5
3 2 9 8
6
2 8 5
6 4 1 8
1 9 7
3 6 2 4
3 7 1 2
5 8 7
8 7 4
Hard #6
9 2 8
5 8 3
1 4 9
2 1 4 6
6 3 7
1 6 8
4 7 6 2
6 2 3
1 6 5
Hard #7
8 7
4 1 8 2
6 7 3
1 2 5 4
9 8 1
3 6 2
5 2 4
3 2 5
9 1 8 6
Hard #8
6 7 2 1
4 5 8 3
2 5 3
6 7 5 1
9 4 6
2 9
7 5 8
3 5 1
4 3 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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