Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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