Printable Hard Sudoku

Set lhpl3u. 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
3 8
7 1 5 9
5 6 2
7 5 3
8 6 7 1
6 2 3 9 8
5 6
6 1 2 3
3 9
Hard #2
7 3 9
7 8 5
3 9 8 1 4
2 8 1
1 4 3
4 2
5 9 3
2 4 5 6
8 3 2
Hard #3
4 3
1 8 4
2 6 5 7
6 3
3 6
5 8 7 1 4
1 3 6 7 8
7 3 6
2 5 9
Hard #4
8 9 2 5
6 3
1 5 9
7 2 3
3 6 4
2 7 4
3 5 4 2
6 8 3
9 3 6 4
Hard #5
4 6
6 7 4 1
4 5 3
1 8
6 5 9
5 3 9 7
1 8
1 7 6 9 4
9 2 5 3
Hard #6
1
1 5 9 3 2
3 8 6
4 7 6
8 3 6 4
5 2 3 7 9
9
6 9 5 4 1
2 1
Hard #7
6 7
8 7 4
9 4 1
6 9 2
2 4 5 6
5 7 3 2 4 8
1 6 3
9 3 7 8
8
Hard #8
9
6 7 4 8 1
2 6 7
7 1 2 8 4
9 1
9 4 8 3
3
6 4 9 5 2 7
1 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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