Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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