Printable Hard Sudoku

Set 1nct5na. 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
3 7
4 8 6 3
7 5 3 1 8
4 2 9 6 8 5
7 4 3
5 2
6 2
6 7
7 1 9
Hard #2
8 5 7 9 4
9 8 6
1 3
4 1 2 6 9
8 9 5 3
4
6 3 7
9 3
3 6 5 1
Hard #3
4 8
2 9 7 5 4
5 2
2 3
8 9 2
3 4 7
6 7 4
5 2 3 1 9
8 7 9 5
Hard #4
6 7 5 8
5 8 1 7
6 4 3
4 1
3 2 5
6 7 1
2 8 6
9 7 2 8
5 8 9
Hard #5
5 2
3 2 7 8
4 9
5 6 1 8 3
8 1 4
7 1
2 3 6
6 7 3 1
4 7 9 5
Hard #6
1 5 7
6 8
2 3
7 4 9
3 5 1 6
8 2
4 5 7 9 8
9 2 5 7
7 3 4 2
Hard #7
2 8 7
1 5 2 9
2 9 4 8
4 9 5
2 7
6 3 9
5 9 2 1 3
2
6 3 7 4
Hard #8
3 2 1 6
6 7 4 5
1
6 2 9
3 2 7 4
2 9 5 8
4 8 7
3 8 5
1 5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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