Printable Hard Sudoku

Set 16uws8h. 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 7 2
3 6 9
7 8 5 3
8
7 5 2 8 9
3 6 1 8 7
5
9 7 2 6
8 7 9
Hard #2
9 5 2 4 7
6 2 4 5 9
5 9 3
7 9 6
3 5
1 2 4
8 3 7 1
4 5 8 2
Hard #3
9 1 5
5 2
9 3 4 8 7
4 6 8
5 6 7 2 3
3 7 9
7 6 1
6 3 1
4 2
Hard #4
6 4 7 2
1 6 7 3 5
3 1 8 6
3 2 4 8 1
7 4 8
5
2
1 5 2
8 9 3
Hard #5
2 1 3
8 5 1 3
2 9
8 5 3 2 6
7 5
3 6 7
1
6 2 5 1 9
3 8 6 2
Hard #6
7 5 2 8
4
6 2 3 5
9 2 7
5
5 3 1 2 8
3 6 1
9 1 7 6
1 5 4 2
Hard #7
5 6 2
9
6 4 5 1 2
6 1 2 8
3 2
1 6 8 7 3
6 9
7 1 4
9 7 4 1
Hard #8
2 3
6 1 7
6 4 9
2 5 3 1 8
5
1 8 7 3
9 5 4 7 1
4 3 6 9
8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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