Printable Hard Sudoku

Set 1vvp408. 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
4 2
6 1
1 7 8 9
1 9 5
3 4 7 6
1 4 8
5 1 7 3
9 2 5
7 8 4 9
Hard #2
6 8
3 9 4 7 6 1
5 4 3
2 3 5
2 7 3
4 9 7
4 1 6 8
5 6
9 4 8
Hard #3
2 4 5 8 7
5 6 4
6 3 4 1 2
4 2 8 5
1
9 6 8
6 7 9
1 4 3
5 8
Hard #4
7 4 6 5
5 9 3
1 6
4 7 8 3
8 9 6 2 5 7
5
3 5 9
7 8 2
6 1 3
Hard #5
4 1 9
7 6 5 3 4
3 5 8
7 8 4
4 2
5 6 7 2 8
9 5 1
1 6 7
9 5
Hard #6
2 4 1 9
3 8 1 7
2 5
6 4 2 7
2 8 7
7 4 3
1 6 3
5 7 9 4 3
9
Hard #7
3 4 5 9 8
3 8 7
7 3 4
7 9 6 4 1
6 9
1 5 8
2 7
9 6
1 6 2 8
Hard #8
4 5 8 9
9 2 6 8
7 3 5
1 9 2 6
7 4
4 3 1 2 9
7 8
5
2 7 4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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