Printable Hard Sudoku

Set 7s8wao. 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
7 5 1 9
3 9 8
8 3 2
7 6
3 1 9 4
5 7 8 3
6
2 5 7 8 6
4 1 9
Hard #2
2 1 5
3 9 7 1
4 6 3 9
1 2
5 7 4
8 5 6 9
8 1 5 7
2 1
5 1 6
Hard #3
4 1
8 2 7 3 5 6
4 9 1 3
3 1 5
5 3 7 1
7 9
9 7 2 6
1 4 6 7
Hard #4
2 9 7 5
9 7 8 3
5 8
7 6 3
8 3 9 2
6 4
7 5 1 4
6 3 1
9 7 8
Hard #5
8 6 5
7 8 9
7 9 2 6
6 5 4 1 2
9 4 2
5 8
7 3 1 6
3 7
8 1 2
Hard #6
1 7 8
3
8 3 9 5
3 6 9 8 1
8 4 2 9
9 5 6
6 7 1
4 3
1 5 4 9
Hard #7
4 9
8 1 6 2
5 3 7 9 1
9 7 1 6
7 4 1 3 8
6 5
5 4
1 5
2 9 7
Hard #8
2 7 4 3
6 4 2 3 5 7
5 9 2
4 1 8
8 7 2 1 4
9 2
1 6
9 5 6 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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