Printable Hard Sudoku

Set 1024uuv. 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
7
3 2 8 9 1
9 4 2 5
8 1 4
3 8 6
7 9 4 8
4 5 7
1 4 2 7
7 3
Hard #2
2 5
6 7 5 2
9 7 1 2 3
4 8
3
7 3 8 6 1
4 7 6
6 2 9 4
4 8 2
Hard #3
2 5 8
9 1 8
5 2 9 1
4 1 9
2 9 3 8 5
6 7 2
4 3 6 5
8 1 2
7
Hard #4
9 4 1 6
8 6 7
2 5 8
2 5
6 7 8 1
6 4 2
4 8 3 1 2
5 3
2 9 6
Hard #5
3 1 7
1 3
6 2 4
4 1 3 5
8 5 2
5 2 3 1 6
5 2 9
7 9 6 5
1 8
Hard #6
4 7 9
8 5 1 6
9 5 1
5 8 4 3
6 5
1 8 2
4 3
8 7 1 6
2 1 8 7
Hard #7
4 5 3 6
2
6 3 9 7
6 7 1 2 3
4 6
6
6 1 4 5 8 7
7
8 5 2 6 1
Hard #8
9 2 7
1 9 5 7
8 2 3
1 5 3 6
9 8
6 8 9
7 5
4 1 3 7
3 4 1 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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