Printable Hard Sudoku

Set 54ddgs. 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
5 8 3 9
4 7 2 9 6
9 7 1
7
8 5 9 4 3
9 5 2 1
6 2 8 7 3
4
6
Hard #2
8 7 6
6 8 2 9
7 4
1
6 3 4 7
3 4
4 3 2
8 6 3 7 4
6 2 5 7 1
Hard #3
2 6 5
3 2 9 7
9 1 4 6 2
6 8 9 4 5
5 6
7 9 4
4 2 7 3
8 9
3
Hard #4
5 6
6 9 7 3
3 1 5
3 2 9
5 9 4
4 1 2
1 9 3 8 7
9 5 1
8 2 4
Hard #5
4 3 1 8 7
6 9
7 4
5 7 8 6 9
5 2 8
8 1 2 4
4 1
6 3 7
1 2 7
Hard #6
1 7 5 2
6 8 5
8 9 4 1
7 8 6
3 9 1 4
9
4 1 5 3 8
8 4
2 9 7
Hard #7
3 7
1 2 3 4 9
5 4 6
8 4 1 2 5
2 6
3 7 2
1 6 9 4
2 4 5 3
2
Hard #8
4 8 9
1
5 9 1 4 7
8 7 2 4 6
1 3 2
2
9 8 1
4 5 6 7
9 7 6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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