Printable Hard Sudoku

Set pfktg5. 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 3 5 4
5 9 2 6 4
1 7
6 2
1 7
2 7 8
9 5
2 8 1 4 9
9 7 3 8
Hard #2
4
4 1 7
6 2 8 1 5 7
9 4 6 8 7
3 6
8 9 1
7 6 2 8
5 9
3 2 9
Hard #3
5 3 9 2 6 7
4 1
8
9 7 5
8 3
4 8 6 7 3
7 5 8
3 2 6 5
4 9 3
Hard #4
4 9 7 1
8 3 7 4
6 8 2
4 5 9 3 6
7 5 9
6 8
2
5 1 2
3 1 5 8
Hard #5
3 9 5
6
4 6 7
5 1 3
4 6 3 2 7
7 8 2 6
8 2 5 7 4 9
9 1
4 5
Hard #6
7 1
8 3 2
4 2 6 8
1 7 8 4
9 5
6 5 7
8 3 6 9
5 3 2 7
4 8 2
Hard #7
7 1 2 6
9 3 7 5
4 9 6
2 3
5 7 8 4 3
9
2 6 4 1
3 9 4
5 3 6
Hard #8
7
2 5 4 3
6 7 8 9 4
9 1 6
1 7 6 9
4 3 2
2 3
9 2 5 7
5 7 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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