Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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