Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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