Printable Hard Sudoku

Set s6uzlk. 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
5 8 4
4
3 9 1
1 7 2 3 8
9 6 1 5 7
6 3 1 2
2 9
6 7 4
8 1 3
Hard #2
8
5 3 4
6 9 2 3 5
8 9 4 3
5 1 8 6
3 7 9
2 6 9 3 7
1
7 8 4
Hard #3
8 5 2
3 6 4
6 1 3
6 5 4 3
4 7 8 3 1
2 7 9
5
7 2 1 9
1 6 4
Hard #4
6 8 7 9
6 3
9 4
5 8 2
9 1 7 5 8 6
9 6 1
4 9
9 5 3 8
6 5 4
Hard #5
1 6 5 8
8 6
4 2 9 7
2 4
5 9 3 1
1 9 8 3 7
3 2 6 8
4 9 1
8
Hard #6
3 8 2 4
9 3 8
1
7
4 1 3 6
7 9 1 5
9 2 5 6
3 4 2 9
7 1 3 4
Hard #7
9 5 1
8 3 1
2 6 9 4 3
7 2 5
8 4 2
4 6 1
3 4 7
6 3 2
2 1 5
Hard #8
2 4
1 9
6 5 4 1 3
5 8 2
6 8 9 3 7
9 3 4 6 5
3 8
2 7
7 6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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