Printable Hard Sudoku

Set pfjl4n. 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
8 3 6
6 9 2 1
3 8 9
3
7 5 2 1 8 3
6 9
8
2 9 7 6 4 3
1 4 7
Hard #2
8
9 1 6
2 9 8 5
5 8 1
1 4 6 5 2 8
3 9
9 6 2
5 9 7 3
4 2 1
Hard #3
8 2 7 9 6
7 9 4 5
2
4 9
9 8 7 6 2
8 1 4
5 3 2 4 1
3 8 4
3
Hard #4
9 4 8
5 1 7
4 2 5 9 3
5 6 7
2 8
8 9 7 4
2 5
3 6
1 7 4 9 6
Hard #5
8 1 3
9 4 1 7 8
3 7 5 6
5 1 7
5
1 4 3 6
5 7 4 1
1 6 9
9 2
Hard #6
4 9 1
8 6 4
6 8 7
3 2 4 6
8 4 2
2 5
8 1 5 3
5 2 9
7 6 9 5
Hard #7
1 9 4 6
9 6 7
8 7 2
7 3 2
2 3 9 5
9 2 8
6 4
2 1 5 6 8
4 2
Hard #8
9 8 4 1 6
7 5 8 3
2 6 7 8
8 1 2
8 1
3 7 5
8 1
5 9
2 5 6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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