Printable Hard Sudoku

Set 1mfmt5v. 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
9 1 8
9 5 6 1
6 1 9
5 3 1
2
8 4 1 5 6
8 4 3
3 6
9 6 2 4 8
Hard #2
8 1 9 6
7 4 8 5 1 3
3 6
3 7 9 4
3 5
4 7 3
1 4 7 2 8
9 4 2
Hard #3
4 8
3 6 9
7 2 1 6
7 9 5
1 9 4
4 3 2 8
5 7 6
9 1 5
4 9 7 8
Hard #4
7 2 6
4 1
8
4 7 9 1
5 1 7
9 8 1 3 4 2
4 6 5
8 9 7 4
3 2 9
Hard #5
2 1 6
3 4
3 6 5
8 5 6
7 9 1 5
3 7 4 8
3 5 2 7
7 4 2 9
1 9
Hard #6
4 9 5
7 9 3
7 4 1
1
1 5 7 9 4
4 5 8 6
7 5 9 8
9 7 2
2 4 3
Hard #7
3 8 7 5
5 3 2
1 4 7
2 7 1 3 8
5 3 9 2
5 9 4 2 7 6
3 6 5
7
Hard #8
5 7 3
9 8
6 7 4 8 2
4 6 9 8 2 5
9
3 8 6 4
7 3 6 4
1 2 8
8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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