Printable Hard Sudoku

Set 42pkg8. 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
2 7 9
6 9 1 8
5 8 6 7
6
7 3 5 1 4
4 7 3
2 1 6
3 6 4
2 3 7
Hard #2
9 1 8
7 6 4 2 5 9
5 4
4 1 8 2
3 7
6 1 4
2 3 8 4 6
3 5 7 1
Hard #3
3 1 2
5
6 2 9
1 9 7 2
4 3
6 2 5 1
7 6 1 4
4 9 7 8
4 7 9 6
Hard #4
4 1 5 6
7 8 3 2 4 5
5 1 6 7
6 5 8
7 3
9 4 3 2
5 9 7
4 8 7
Hard #5
9 7
3 7
4 2 3 5
5 6 3 8
4
4 6 1 9
7 2 1 8 5
6 7 2 9
3 9 7
Hard #6
3 7 5 2
1 8 6 7
7 8 5 6
8 1 9 6 3
4 7
9 6 8
6 1 8
3 2 7
3
Hard #7
7 2 4 6 9
1 4 3 6
9 1
6 1 8
4 5 3
2 4 6
4 1 2 3 7 5
7 5
3
Hard #8
1 4 2 3 8
3 4 2 7
8 5 6
4 8
8 4 6
7 5 8
6 3
5 7
7 9 8 1 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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