Printable Hard Sudoku

Set 483lnh. 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 7 5 6
6 5 7 9 8
1 4 5 7
8 1
2 8 4
5 1 7 9
3 9 5
7 6
3 9
Hard #2
3 4 8 2
9
8 5 1
7 5
8 3 6 7
5 6 9 1 4
6
3 4 9 2 8 7
5 7 9
Hard #3
8 6 9
4 8 5
4 3 6 7
3 7 2 5 4
5 9
6 3 1
6 7 3 1
6
3 8 4 2
Hard #4
4 3
9 2 5 6
1 2 9 4
1 6 9
4 5 7 2 6
6 8 4
1 8 6
5 9 3
8 7
Hard #5
5 1 7 6 8
6 4 3
6 1 9
9 1
1 3 6
8 2 6 1
8 9 6 1
5 7
6 4 2
Hard #6
5 7 4
6 1 2 8
8 3
4 5 9 2 6 1
7 5 9 8
1 3
4 2 9
7 8
7 1 5
Hard #7
9 8 2 5
2 4 3 7
4 1
9 6
1 4 2 5
5 7 3
5 2 8 6
4 1 8
3 9 7
Hard #8
8 4 6
2 9 8
9 3 8 7 1
5 2 9
7 9 4
8 6 3 4
9 8 2
5
1 4 2 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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