Printable Hard Sudoku

Set 1a8qgoj. 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 8
8 7 9
6 4 7
7 6
5 4 8
3 6 9 5 1
8 3 2 1
6 1
2 7 8 4
Hard #2
3 8 9 4 5
4 5 3
5 8 6 1
6 3 9
2
5 6 7
8 9 5
1 5 4 9 7
2 4
Hard #3
6
7 8 6 9
9 2 7 3 8
6 1 3
5 2 3 4
2 8 4 6
5 8
8 4
6 4 5 2
Hard #4
1 3
3 7 1
6 4 5
4 3 9
7 2 1
8 7 3 4 2
4 2 1
6 8 5 9
9 3 6
Hard #5
7 1
8 6 1
1 5 9
1 2 8 6
3 5 4 8
9 3
4 6
7 8 2 4 9
8 9 7 2
Hard #6
7 3
5 9 1 6 4
6 2 5
5
3 4 1 6
7 1 8 9 5 2
3 2 4
4 9 5
9 8
Hard #7
2 5 3 4
1 9 6 5 3
5 6 1 2
6 4 8 9
9 4
8 9 1 6
7 4
1 3 2 9
Hard #8
2 6
7 3 5 6
1 9 5
9 5 8 2
2 3 4 6 9 8
8 6 7
7 5 9 3
3 7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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