Printable Hard Sudoku

Set pmqto0. 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 5 4 1 8 2
2 9 3 6
4
7 4 8 5
3 1 4
1 2 9
2 9
8 7 2
6 2 5
Hard #2
4 3 9 8 7
2 5 1 3
7 9 2 1
4
5 1 8
6 9 1
2 8 6
4 7 9
5 6 2
Hard #3
5
9 8 5 1 2
6 9 3 7
1 2 5 9 3
8
1 5
8 2 6
7 6 8
7 3 8 1 2
Hard #4
1 8
1 2 6
9 7 8 2
5 4 3 7
1 8 5
4 9
7 5 8
8 4 5
1 8 6 3 9
Hard #5
8 4 1
7 2
5 1 4 3 7
5 6 1
7 5 9
9 8
6 3 8
1 9 2 3 5
4 5 7
Hard #6
1 9
3 7 5 6
8 3 4
2
3 4
9 6 2 1 3
5 2 1 7 8
1 7 4 6
6 5 1
Hard #7
1 6 3
4 8
3 5 7 4 1
1 6 3
9 8 1
7 4 2
5 2 6 7 8
4 6 7 2 5
Hard #8
9 1
8 4 3 2 1
5 7 8 4
7 2 6 8
8 9
9 4 6 3
1 7 2
1 4
4 3 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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