Printable Hard Sudoku

Set 16rz8qq. 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
6 3
6 3 8
5 4 8 9
9 3 7
6 2 9
3 5 8 1
1 4 7 6 3
9 5 2 7
7
Hard #2
3 6 8
7 3 8
2 1 3 6
7 9
3 1 5
4 8 2
6 5
1 7 3 6
5 4 6 1 9
Hard #3
3
8 4 7 6
7 9 8 4 5 3
7 1 9
4 8 5 7
1 5 7
6 5 2
7
2 3 9 1
Hard #4
5 6
3 2 1 9
9 5 6 7
1 5 4
8 9 2
1 4 3 8
5 7 8
9 8 2 6 1 3
Hard #5
2 8 4 9 5
1 2
8 9 4 2
7 5 1
9
2 6 3
9 2 8 1 7
5 7
4 7 8 9
Hard #6
3 9 6 7 1
1
6 1 4 3
6 8
9 6 4
5 9 1
3 2 8
5 1 6
1 2 8 5 4
Hard #7
5 2 7 3
4 5 2
3 1 2 8
9 3 8 2 7
5 4 9
6 7 1
8 1 5
7 3 6
6
Hard #8
7 2
1 8 5 3
9 8 2
7 5 6 2
5 1 3
3 8 6
2 7
8 1 6 2 9
3 9 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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