Printable Hard Sudoku

Set xss40x. 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
5 8 3
7 6 4
2 3 1 5 7 8
5 2 4
1 2
5 9
5 9 6
4 8 2 5
6 4 2
Hard #2
8
4 8 1 7
2 1 7 4 6
5 2 9
1 3 5 6 8 7
5 3
9 3 6 4
2 9
9 3
Hard #3
4 8 9
7 8 1
2 8 6 7 5
2 4
7 6 2 3
5 4 9 1
6 8 4
5 9 2
7 1
Hard #4
2 3 1
1 6 7 5 8
7 9 6
4 2
7
1 8 4 6 7
5 2
4 3 6
5 6 7 3 1
Hard #5
1 9 8
6 7 2
9 5 4
9 3
1 5 9 3 4
4 2 6
4
7 5 9 4 1 6
5 3 7
Hard #6
4 5 1 7
1 2 5 3 6
7 6 2
9 5
4 8 3 1
5 7
8 3 7 1
9 2 7
6 8
Hard #7
9 5 7
8
2 6 9
5 3 4
1 7 3 6
1 2 7 4 3
3 2 7
1 4 6
6 8 7 1
Hard #8
5 3 9 6 8
9 8 4 1 5
5 1 7
4 2 6
7 3 4 5
9 7
1 2 9 6
5 6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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