Printable Hard Sudoku

Set 1f0azxn. 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 3 7 2
8
1 4 3 5
5 4 6 7
5 1
4 2 8
3 8 7 9 2
4 3 9
4 6 7
Hard #2
8 6 7
3 7 4
7 6 1 3
6 7 5 9 1
2 4
8
6 9 4 7
8 3 6 1 4
2 8
Hard #3
9 7 4
4 7 3
2 8 3 1 4
9 2 1 5
5 2 6
5 7 8
8 2 1
1 8
5 1 4
Hard #4
7 6 8 9 1
5 8 4
2 7 5 8
5 4 2 6 9
3 1
8 2 1 9
4 3 8
9 8 3
Hard #5
3 2 6
7 2 3 1
8 1 3
2 4
4 9 8 3
8 7
4 5 1
5 3 2 6 9
8 3 2
Hard #6
8
7 6 8 9
3 9 4 5 2
5 8 2 3
2 5
1 3 6
2
4 7 8 9 1
7 9 4 8
Hard #7
7 4 1
8 9 4
3 5
2 6 1 9
6 8 3 9 7
9 3 8 5
8 2
4 1 6
7 2 9
Hard #8
9 4
7 3 4 6
6 8 7 1
2 5 6
5 1
8 1 7 3 2
3 9
6 4 7 9
5 8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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