Printable Hard Sudoku

Set 3l7h1x. 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
6 8
2 4 3
1 5 4 6
1 4 6 5
5 4 8
9 7 6 3
5 2
6 1 9 8
3 7 9
Hard #2
6 1 4
1 7 3
3 2 9 1
7 4 8 5
8 5
5 6 1 2
3 2 6 4 5
7 3
5 6
Hard #3
3 9 8
7
1 6 4 5
7 1 6
4 8 3 5
4 1
5 2 8 3
6 7 2 9
3 9 6 1
Hard #4
6 1 8
2 1 8 7
2
7 6 3 5
5 9
9 3 5 2
1 2 9
5 3 1 8 7
8 7 4
Hard #5
1 2
6 9
7 8 9 4 3
4 3 6 1
2 1 5 4 9
2 3
5 8 2 1
4 2
1 3 5
Hard #6
6 2 8 4
4 5 1 9
2 5 8
7 8 5 1
1 3 4 2 6
2 8 3
3 2
7 1 5 8
Hard #7
1 5 2 8
7 1
2 6
2 6 4 7 9
9 2 4
4 8
2 5
3 6 2
6 1 7 8 4 3
Hard #8
2 3
7 2
9 7 8 5
8 9 4
7 9 4 1
7
7 6 3 4 2 5
8 3 9 1 6
9 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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