Printable Hard Sudoku

Set 9ekn0f. 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
4 9 6 7
1 7
2 6 9
9 4 5
3 1
4 1 8 3
2 3
6 2 7 5 9
7 6 9 2
Hard #2
5 6
1 7 2
3 9 5 1
5 2 6 7 1
7 1 4 8 6
7
6 4 3 7
9 5 3
2 5
Hard #3
4 7 1 3
9 3 4
5 4 7
3 1
5 2 6
2 8 5 4
4 9 3 8
8 4 9
9 8 5
Hard #4
8 5 2 1 3
4 2
1 6 7 3
8
3 9 8 1 6
9 3 2
1 3 4
5 9 3 8 2
8
Hard #5
4 8 2
5 9 7 4
7 6
9 5 7 8
3 7
2 9 6 4 5
6
2 8 7
7 8 5 1 3
Hard #6
2
4 1 7 6
3 9 2 8
2 4 1
8 5 2 3 7
7 6
3 5 6
1 9 7
1 7 3 5
Hard #7
5 8 9
8 6 3
2 1 7 6
6 9 8 2 1
3 7 2 6
8 5 4
2 6
4
1 3 7 9
Hard #8
3 1 4 2 8
8 2
5 8 4 6
1 4 7 8
5 6 9
9 7 2
5 6 1
5 8 4
3 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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