Printable Hard Sudoku

Set 3mo3f8. 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
3 9 5
4 7 2
4 9 2
7 4 1 2 3
1 7 5 2
9 2
2 3 4
9 8 6 5
1 9
Hard #2
8 1 5
9 5 4 3 6
3 7
4 8 3
4 5 6 8 9
7 6
6 4 3 5 1
1 7
3 9
Hard #3
1 8 9
9 5 1
6 5 3 7
7 3 2 5 4
7
9 1 8 3
2 1
8 6 7
9 7 5 4
Hard #4
8 1
6 5
3 1 2 6 8 7
8 3 1
9 4
3 7 1 4 5
7 2 4 3
9 1 3
8 5
Hard #5
7 1 2
4 3 7 9
2 6 5 7 1
4 6 5 3
8 6 1
3 9 6
5 6 2
2 9 8 6
Hard #6
7 9 1
7 8 3
3 6 4
5 2 9 3 6
6 1 9 5
8 7 1
9 2 1
6 9
7 2 8
Hard #7
9 3 5 1 7
8 7
4 1 6 3
3 2 6 9
9 7 3 6
9 4
7 2 9
1 6 9
4 5
Hard #8
4 2
7 1 9 2 5
7
5 9 4
7 3 2 6
1 8
1 3 8 5
3 2 9
1 7 4 8 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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