Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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