Printable Hard Sudoku

Set 14a2wlt. 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 4
5 8 6 7
9 1 7 5 2 3
7 1 9
6 9 4
5
2 4 7 3
8 1 5
4 3 8
Hard #2
6 9 3
4 3 5 7 8
6 5
9 8 4 1
7 4
6 2 9 3
9 5
1 6 7
6 8 1 2
Hard #3
5 8 9
3 4
9 3 7 1 8
7 5
8 1
5 8 4 9 7
2 5 7 6 8 9
8 6
4 3
Hard #4
8 6 4 9 5
2 3 8 4 6
7 1
9 4
7 6 5 3 8
3 4
9 1
7 2 5
5 4 8
Hard #5
4 7 8
6 1 7 9
2 3 5
7 6 9
6 3 5
4 8 9
3 8 5
4 6
5 2 3 4 1
Hard #6
7 2 4 5
1
3 4 2 8 9
5 2 6 7 9 1 8
6 2
8 6
3 1 9
4 3
1 2 6
Hard #7
1 2 6 5
3 5 7
8
4 1 9
6 8 4
5 7 4
6 2 4 9
9 8 5 1
3 9 5 6
Hard #8
9 1 2
1 2 3 7
3 7 5
8 5 1
7 6 4
6 2 8
9 2 5
5 1 3 9
6 4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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