Printable Hard Sudoku

Set kdpsf2. 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
5
8 1 3 5 9
9 6 1
5 8 4 6
7 8 6
5 4 9 3 7 2
5 6
3 7
1 9 3
Hard #2
1 8 5
4 1 2 9
7 3 4
1 6 3 7
9 2 1 3
5 9
6 5
6 9 5
5 7 1 2
Hard #3
6 2
4 3 8
4 2 6
5 2 8 1 3
3 5 7 8
3 2 4 9 6
1 8 2 3
6 7 4
Hard #4
9 4 2 7
3 1 4 2
2 3 7 5
8 1 7
6 8 4 2
3 5
6 3
8 9
6 9 4 3
Hard #5
3 7
5 3 2 1
7 8 1 4
2 7 6
4
9 6 8 5 4
8 4 3 9
7 4
3 6 1 8
Hard #6
1 2 7 8 4
2 3
2 6 7
7 9 1 6
6 4 1 2 3 7
5
7 9 5 6
8 1
5 4
Hard #7
9 1
7 3 4 2
4 3 5 6
9 7
5 8 4 2 6
2 8 3
5 8 9 1
7 1 2 5
6
Hard #8
5 1 4 6
1 7 9
4 9 8
4 6
9 3 5 8
6 2 9
6 2 8
7 9 6 2
8 1 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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