Printable Hard Sudoku

Set 1afi8nq. 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 9 1 4 3 5
1 7 8
3 9
8 3
6 1 9 8
6 4 2
2 4 6 9 8 5
7
3 6
Hard #2
7 6 4
3 9 5 1
1 8 2 7
4 1 2
3 9 7 4
9 3 8
1
2 5 7 6 1
2 5
Hard #3
7
6
5 1 3 9 7
9 5 8 7 1 2
1 5 8
8 2 4
6 1 9
2 6 9 5
8 1 2
Hard #4
4 2 7
6 9 7 1
6 8 9
1 3
5 7 6 4 1 2
9
2 1 7 3 5 4
8 7
6 5
Hard #5
5 4
3 2 4 1
4 1 2 7
8 1 2
9
1 7 6 9 4 5
9 8 5 1
7 5 4
4 9
Hard #6
8 5 2 6 1
6 5 8
1 3
3 5 4 6 9
6 5
6 9 3
7 1 8
1 8 6 7
4 1
Hard #7
3 8 5 9
4 9
6 4 7
6 5
2 4 1
3 1 2 4
1 8 4 9
2 5 6
6 8 3 7
Hard #8
1 2 9
8 4 5
2 3 6 7
6 8 9
9 8 6 5
1 8 4
5 7
9 8
2 1 3 4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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