Printable Hard Sudoku

Set 68vh00. 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 9 5 3 4
7 5 6 8 3 2
9
2 9 3
1 9
2 6 7 5
9 1 3 4
5 3
6 1
Hard #2
2 1 4 5
7 8
5 7
8 9
1
8 2 3 6
2 9 1 8 7 4
1 7 6 2
5 8 7 6
Hard #3
9 4
9 8 7 5
1 3 9
5 9 1 4
7 9 4 3
3 6 5 9
2
6 7 8
4 7 2 5
Hard #4
4 5 7 9 2 1
6
7 5 2 4
7 1 6 4
8 5
6 8 1
3 4 5
2 9 8
6 3 4
Hard #5
3 9 8
9 2
4 5 8 1 3
1 6 4
6 5 3
9 2
7 6
9 5 2
3 2 5 7 8 1
Hard #6
1 4 8
5 2 6
3
1 7 8
8 6 7
5 8 4 9
3 4 8 7
8 9 2
4 9 7 6 5
Hard #7
5 4 6
9 3 5
9 7 2 4 1
5 1 3
4 3 2 8
9
3 9 7 1 8
6 1 4 5
7
Hard #8
9 2 8 1
4 1 9
7
6 8 1 3
7 3
5 7 8 2
7 1
2 9 7 4 6
5 4 8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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