Printable Hard Sudoku

Set 16szmc0. 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
7 2 1 3
9 6
6 3 4 1
2 1 3 6
4 8
3 6 2
4
8 1 3 4 9
6 3 4 5
Hard #2
1 7 6 4
5 2 8 9
9 1
6 1 3 4 7 8
4 9 2
8 7 3 5 6
2 8
3 4 8
Hard #3
2 9 7
5 2 9
7 6 5 4
8 3 7 2
5 7
1 8 3
9 6 2 7
4 6 2 1
8 4
Hard #4
5 3 2 9
4 8 3 1
1 6
5 3 1
6 7 9
7 8 9 5
2 7
7 6
9 4 8 3 2
Hard #5
4 3 7 6
6 8 9 4
3 5
6 8
4 1 6 5 2
9 1 2 8 6
5 7 2
9 2 5 1
Hard #6
9 8 4
1
5 8 2 1 3
9 7 5
1 8 9
6 8 5 9 7
3 5 4
7 1 4 3
2 6
Hard #7
8
9 2 7 6
6 4 5 1
6 2 3 9 4
5 8 6
4 6 7
5 9
7 9 4 1 2
6 8
Hard #8
9 1 7
2 5 9 3
3 1 6
9 6 8
8 7 3 5
1 6 7
3 6 4 2 8
7
8 6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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