Printable Hard Sudoku

Set 12mo6my. 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 8
2 7 4
6 9 4 2
7 9 8 4 2
3 4 6
6 8 2 1
6 5
1 5
6 7 9
Hard #2
5 1 9
4 5 7
1 8 9 6 3 5
2 3
1 4 3 2
4
7 2 3 6
3 7 9
4 5 8
Hard #3
1 4 5 3
4 5 6
8 1 6
5 2 4
7 2
3 4 5 9
1 9 3 5
8
4 6 7 8 9
Hard #4
9 7 2 8
9 2 7 3
2 5
4 6 8
1 5
6 1 9
8 7 3 4 6
1 5 8 3
2 7
Hard #5
3 6
8 7 9 4
1 6 3 8 9
6 1 7 2
7 2 1
9 4
2 8 6 7
5 4 8
8 1
Hard #6
5 6
6 4 3 8 1
5 8 2
1 8
9 1 5 7
7 2 4
5 7 2 3
5
3 1 4 9 7
Hard #7
8 9 6 1
9 5 1
6 8 3 4
6 7
8 9 2 3
5 7 3 6 8
7 9
3 1 5 8
6
Hard #8
5 7
7 8
9 1 7 2
4 1 3 2 6
6 4 7 5
5 4 7 1
7
3 4 6 1
8 9 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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