Printable Hard Sudoku

Set 1ucph9v. 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 6
9 3 5 4
3 8
6 2 4
3
4 2 1 9 3 8
2 4 7 1
9 1 4
3 1 5
Hard #2
8 5
7 9 3
9
3
2 1 8 7 4
9 4 5 2 8 7
1 9 8 3
6 2 1 7
6 4 1
Hard #3
5 3 4 2
9 5
4 1
1 9 8 4
5 4 8 2
9 1 2 5 3
2 6
8 3
2 6 7 5
Hard #4
6 2 8
5 1 2 7
1 6 3
8 3 6 5
6 4 8 3
9 8
4 2 6
1 5 6 2 7
9
Hard #5
9 3 5
6 7 2
8 5 2 4
9
1 5 3
4 1 7 8 3 6
3 8 1
4 2 5
5 8 2
Hard #6
4 5 1 2
5 4
3 1 2 8 7
9 4
8 1 6
2 7 1 9 8
7 8
5 9 2
7 6 4
Hard #7
5 2 8 3
7 1 2
6 5 4
6 8 3
3
8 5 3 1 9
3 1 9 2
2 6 4 3 1 5
Hard #8
6 2 5 7
4 6 7 3 9 2
3 1 2 4
3 6
5 4
3 4 9
3 7 6
1 2 5
7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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