Printable Hard Sudoku

Set 25va9e. 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 4 5
3 7 9 8
9 3 7
1 5 8
6 2 9 4
5 9
1
3 7 2 9
2 6 3 7 4
Hard #2
5 4 3
5 9
3 7 9 4
5 1 9 3
7 3 8 6 5 4
4 2 6
7 3 6
2
9 1 7
Hard #3
7 4 6
6 9 3 4
8 7 6 5 9 3
7 5 1
6 4
3
2 6 8
3 4 2 9
8 3 1
Hard #4
3
1 4 5 8
2 9 1
8 1 6 7
4 2 1
6 7 4 5 3
5 8
8 3 2 1
5 9 2
Hard #5
2 3 4
3 9 5
8 2 1 6
5 1 9 4
2 6
3 1 6 9
8
1 7 5
9 3 1 4 8
Hard #6
3 9 2
4 9
2 8
2 9 3
8 9 6 3 4 7 2
1 5
2 9 3 5
4 8 6 3
4 8
Hard #7
2 5 9 6
5 4 7
9 6 7
1 9 2
7 6
4 7 8
9 1 5 4
2 1
3 4 2 1 5
Hard #8
8 5
3 4 8
6 2 7 9
5 1 3 2 7
5 7 2 9 3
7 6
1 7 4
9 8
3 7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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