Printable Hard Sudoku

Set u09grk. 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 3 2
5 1 7 8
4 8
5 9 3
5
7 1 4 5 9 3
8 4
1 9 2 7 6
7 1
Hard #2
2 5 1
1 7 4 3
9 2 3
6 4 7 3
9 6
9 2 5
7 5 2 1
8 5 4
2 9 1
Hard #3
9 5 7 8
8 7 1 5
3 4 7 8
2 9 6
7 3 6 2
9 8 2
4 3
5 4
9 5 1
Hard #4
5 8 9 2 4
3 7 8
4 6 3
4 7 6
7 1 5
9 1
6 4 5 9 2
5 2 3
4 8
Hard #5
3 6 5
1 5 4 6
9 3
8 5 9
3 8 9 6 2
2 5 8
1 6 2
9 4 1
9 7 3
Hard #6
7 5 6 3 2 8
5 8 4 1
4
8 7 1 3
9 2 8
3 2 5
4 2
2 3 6
1 4 8
Hard #7
5 7 3
9 6 8
6 4 2 5
4 8 9 7 2
3 4 7
6 1 2 3
9
2 3 9 6
5 1
Hard #8
3 9
2 7 8 4
5 9 2
6 1
1 6 5
4 3 9
3 6 9 7
7 5 3
1 8 6 5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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