Printable Hard Sudoku

Set 315pgt. 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
8 7 1 4
2 8
4 3 5 2 1
2 9 4
8 2 3 7
4 5 8
5 4 6
2 7
8 2 9
Hard #2
2 9
6
8 4 7 3
5 4 3
9 8 1
2 6 7 8
2 3 8 1
9 7 1 5 4
1 3 7
Hard #3
5 8
7 3 2
7 9 3 1 5 4 6
1 5 7
4 2
3 5 6 8
3 6
4 1 2
4 9 2
Hard #4
7
4 9 1
9 8 7 4
5
3 4 6
9 1 7 8 2
3 9 2 1 7
5 2 6 3
7 1 5
Hard #5
7
4 5
8 9 3 6
7 6 5 2 3
2 8 5
5 7 9
8 4 9 7 2 6
3 9 5
2 8
Hard #6
5 8 9 4
6 4 5
6 1 5 3 8
9 5
1 8 9 7
5 8
2 8 4
9 5 7 1
4 8
Hard #7
1 9 7 8
6 5 3
8 1 2
3 2 8
1 5
1 7 2 6 9
4 3
9 4 1
8 5 4 2
Hard #8
3 7 6 5
8 1
4 5 9
7 8 6
4 2 1
1 4 3
8 9 3 7
4 8
6 3 5 2 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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