Printable Hard Sudoku

Set 1nmz013. 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
6 5 8
8 9 1
3 9
3 6 5
9 8 2 6
6 1 9 2 7
4 3 5 8
7 8 3
9 4
Hard #2
8 5 2
7 6 8 5 2
3 7 9
6
4 1
7 2 9 5
1 6 2
2 9 8 7 4
5 3 8
Hard #3
9 2
5 8 1 9 4
4 7 3
8 1 9 3
8 7
7 6 4
2 6 8
7 3 5 1
3 8 2
Hard #4
6 4 9 1
1 3 6 8 9
6
4 5 2
9 4 1 8
9 6 7 1 8 4
8 5
2 9 7 3
Hard #5
5 8 7
6 5 9
2
3 1 9 5
6 8 4 3
9 3 7 4
1
9 6 2 1 7 5
2 6 8
Hard #6
7 5 2 1
8 2
1 9
1 4 5 9 7
9 4 7 8
9
6 3 2 4
8 7 5 3
3 6 9
Hard #7
7 3 6
6 3 1
9 6
8 6 1 3 9 5
3 6 7
9 4 8 3
4 5 1 9
2 7
2 5
Hard #8
3 9 8 5 2
8 9 7 1 3
6
1 4
4 5 7 3 1
3 2 6
2 7 8
3 5
5 3 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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