Printable Hard Sudoku

Set q3zuad. 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 2 1 6
7 8
3 4 9
3 1 9
3 4 1 8
5 7
2 8 3 6
5 6 1
6 7 8 4
Hard #2
8 6
3 4 6
2 9 5 3 8 7
9 7
7 2 3 1
5 2 3
8 7 4 5
8 6 3
3 1
Hard #3
1 4
8 9 3 5
5 2 4 3 7 8
4 6
6 3 9 2 7
8
2 8 1
1 8 5
3 4 2
Hard #4
3 9 6 5 7
4 9
7 3 4
1 4 7
5 6
6 8 2
1 5
6 2 4 1
3 9 4 8 2
Hard #5
3
4 7 1 8
9 2 6 4 5
9 6 5 1 8
8 4
3 4 6
5 6 9 1
2 9 7
8 2
Hard #6
5 8 6
7 5 1 2
3 8 7 5 1
4 1 9 5 3
4 6
2
5 9 4
9 2 6 1
8 9
Hard #7
2 4 9
7 8 1 6 5
2 6 5 1 8
1 3
8 9 6
5 1 3
4 2 7
2 7 3 9 5
Hard #8
4 2
6 8 4
9 5 2
8 9
6 9 5 7 1 8
3 7
3 7
6 2 3 9 7 1
4 7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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