Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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