Printable Hard Sudoku

Set 4a9flr. 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 8 7 5
3 9 1 6
3 7
5 7 8 2
2 6 3
1 4 5
7 9
9 4 2
4 5 9 7
Hard #2
5 1 8 3
4 2 6 1
7 4 8
6 8 4 2
6 5 7
3 7 1
9 1
5 1
4 2 3 5
Hard #3
9 6
1
8 5 2
1 4 6
5 9 7 8
3 5
6 9 8 1 5 7
5 9 2 6 4 1
9 2
Hard #4
5 9 3 6
1 6 5
1 2
9 1 7 8
7 8 9
2 4 6
6 5 1 7 8
4 1
7 5 4
Hard #5
8 2 3
9 8
1 5 3
7 4
3 4 2 1
6 5 7
4 1 5 7
6 5 9 1
2 1 6 9
Hard #6
5 7
7 2 4 5 3
6 9 2
9 6 7 2
4 1 3
6
9 7 3
2 7 4 8 9 5
2 4
Hard #7
8 5 2 1 4
9 1 4 7
7 3 2
7 3 9 8
5
4 6
7 5 9 1
1 3 7
2 5 1
Hard #8
4 5 1
3 1 6 7
8 2 5
4 9
7 3 2 5
4 5 9 8
9
4 5 7
6 4 8 1 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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