Printable Hard Sudoku

Set 8l1y8k. 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
1 6 4
7 5
6 1 4 3 9 8 5
5 9 6
2 5 3
7 1 4 3
1 7
7 4 8
3 6
Hard #2
8 6
9 3 2 4 1
1 5
4 5 1
2 4 7
7 1 3 2
3 1 4
5 8 2
9 7 8 6
Hard #3
6 7 1 5
4 8 2
7
4 5 9 2
9 8 2 3
3 5 1 4
2 5 9
8 6 4
3 6 5
Hard #4
1 4 3 6
9 7 1 5 4
6
2 5 7 8
5 2
8 9 7
1 4 8 6 9
6 1
5 3 4
Hard #5
8
4 9 6 2
5 6
7 5 6
6 2 9 7
3 7 9
5 3 6 8
9 7 5 2 3
1 7 9
Hard #6
3 4 6
6 2 3
8 3 1 9 2
6 8 1 9 3 2
5 1 8 6
9 2 8 6 7 5
2
5
Hard #7
9 8 6 7
2
1 3 8 7
7 3 5 9
3 4 1 6
8 7
7 5 1 8 4
8
9 8 6 3
Hard #8
1 7 3 5
4 6 8
2 8 3 7
6 3 2
7 8 6 9 3 4
3 8
1 9
6 7 4
9 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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