Printable Hard Sudoku

Set 1ja7f4n. 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 2 1
9 5 6 4 2 8
7 2 8 3
2 1 6 4 5
5 7 2
1 9 3 6
5 1 4
Hard #2
7 1 4
9 1 8 3 6
5 3 7 8 9
4 9
2 5
3 4 6
6 9 3 2 8
2 1
7 2
Hard #3
9
6 9 8 4
6 7 8 2
4
1
7 9 2 5 8
3 7 6 9
4 2 9 1 6
6 9 5 2
Hard #4
4 7 6 5 3
1 6 9 8
9
4 1 2
2 6 4 9
8 3
7 2 6
8 2 3 5
5 1 7
Hard #5
3 8
6 7 5
9 7 2 1 6
7 9 8 5 1
8 9
6 1
7 8 4
5 4 3 9
8 6 2
Hard #6
5 6 3 2
8 9
3
4 7 2
7 8 5
7 6 1
9 4 7 3 2
5 1 8 6 9
6 2 4
Hard #7
5 4 3
1 8
3 6 9 7
7 3 5
2 7 3
6 5 9
4 2 5 8
8 4 7 2
7 1 6
Hard #8
7 8
9 6
2 1 8 5 3
8 9 1 3 2
5 6 7 3
6 8 7
5 8 1
3 4 9
2 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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