Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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