Printable Hard Sudoku

Set 1sx8icn. 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 5 4 6 3 2
6 8 3 1
7 1 5
5 8 9
2
4 1 5 2
9 2 5
6 8 2 7 4
Hard #2
5 6 9 3
8 7 4
5 7 2
2 3 1 5 8 9
8 3 6 1
2 4
8 4 2
9 4 6
3
Hard #3
1
8 4 5 9
3 7 9 2
5
3 5 8
8 1 6 9
6 1 3 8 4 9
7 2
9 1 2 4
Hard #4
5 9
2 6 8 7
8 4 1
9 3 4
5 6 3 7 1
3 8 6 4 1
7 6 4 9
1 5 6
Hard #5
4 9 2
1 7 9 3 6 4
6 8 3
5 2 1
3 9 7 1
2 3 9
4 2 9
1 7
5 4
Hard #6
9 1 6
2 4 9 8
1 3 5 4 7
6 1
4 7 5
8 2
5 8
3 2 4 6 1
7 9 6
Hard #7
8 1
6 5 1 7
2 7 6 9
2 5 8
7 4 8 3
3 1 4
9 6 7 8
4 2 9
2 5
Hard #8
2 8
3 4 9 1
8 4 9 2
3 6
6 8 7
3 7 6 8
7 6
4 8 1
5 3 4 6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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