Printable Hard Sudoku

Set 10uaofb. 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
9 6 4
4 7 9 1
5 6 9
6 8
4 3 7
7 1 3 5 6
9 5 3
3 7 8
7 3 2
Hard #2
7 5 2
9 8 5 7
2 4 8
7 6 1 2 8
8 3
1 6 5
8 9 2 7 5
3 9
1 2
Hard #3
7 3 4
4 5 2
9 8 3
9 1 4
5 4 6 1
1 4 2 8
1 3 7 5 9
7 2 6
9
Hard #4
8 1 5
5 3 4
1 4 2
8 2 6 5
5 9 8 1
9 5 6 7
5 2
6 9 3
8 6 2
Hard #5
8 9 5 6 7
1 4 2 8
6 1 8 5
5 3 2
6 2
2 9 3 1
2 5
1 4
3 8 7
Hard #6
9 5 8
1
4 3 7 6
2 1 9
6 5
9 6 5 8 2
5 1 7 9 3
4 8 2
8 2 1
Hard #7
7 2 3
9 8
3 6
2 7 6
6 5 7 2 9
9 2 8 5 3
1 7
7 6 4 8
5 1 9
Hard #8
7 9 6 8
1 3
1 5 9
7 8 1 9 3 4
6 4 3 5 7
7
1 8 3
2 3 4
4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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