Printable Hard Sudoku

Set 10tcxpw. 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 5 9 3 7
3 1 2 7
7 6
5 7 2
8 2
4 8 3
3 4
8 1 4 7 5
9 8 6
Hard #2
9 7
5 3 6
2 7 4
6 9 8
9 1 3
5 1 3 2
8 1 6 2 9
4 5 6
9 4 6
Hard #3
1 8
1 6 3 2
3 4 9 5
2 4 3
8 4 5
5 8
1 8 7
5 3 2 6
2 6 9 4
Hard #4
9 7
7 5 4
5 1 3 6 2 8
7 5 6 8
3 1 6
8 2 7
3 1
6 9 5 3
4 6
Hard #5
7 4 2 8
1 5 6 3
9
4
5 7 3 1
3 4 8 2
6 2 1
9 3 7 5
6 2 5 3
Hard #6
1 8 9 2 7
6 9 1
2 5 1 8 3 6
1 5 8
5 2
8 2 7
6 4 3
5 9
7 3
Hard #7
8 1
5 1 2 7
6 5 8
1 8 6 2
9 5 2 3
7 5 2 9
3 8 4
8 9 2 3 6
Hard #8
5 8
7 2 6 8
9 3 8 1
1 4
3 1
9 7 3 2
1 8 5 6
5 4 7
9 6 1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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