Printable Hard Sudoku

Set 1rq12up. 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
3 8 7
5 8 3 6
2 6 9
1 6
2 5 9 1 3
4 2 9
7 4 9
3 1 7
7 8 5
Hard #2
4 5
2 6
8 7
4 6 3 5 7
3 6 9
9 8
8 6 4 9
7 1 9 3 2
3 2 9 5
Hard #3
4 3 5 2 7
8 1 9 2
6 5
7 3 1
3 6 5
6 2 1 9
7 9
6
9 6 2 4 7
Hard #4
7 1 3
1 6 4 3 9
8 2 6
7 2 1
4 1
6 7 9 5
7 3 8 1
9 1 5
4 1
Hard #5
8 7 2
5 8 7 9
2 4 1
2 5 4
8 1 2 7
4 9 1
2 9 3 5
6 2 9
4 9
Hard #6
2 4 7 9 5
3 5 1 2
1 2 3
5 8 6
8 1
3 8 2 4 9
4 6 1
9 2 8 5
Hard #7
4 5 6 1
8 7
7 1
1 2 7 6 3
5 8 7 4
9 8
1 9 7
6 5 3
5 3 6 4
Hard #8
1 5 7 6
5 4 9 2
7 5
2 3 9
7 5
9 3 2 8
6 5 4 3
2 8 5 4
4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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