Printable Hard Sudoku

Set s9l2lq. 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 9 2 6
6 1 9
2 5 3
3 7 9 1
6 9 1
1 4
5 3 7 4
1
4 5 3 8 7
Hard #2
6 1 9 8
1 9
5 3 4 2
2 5
8 3 1
6 7 5 3 1
9 3 6
3 9 4 6 7
8
Hard #3
3 9 5 6
9 4 3
1 2 9
8 3 5
9 4 3
7 2 5
8 1 6 9
4 3 5
2 6 4
Hard #4
8 3 9
2 9 5 6
5 2 8 7
8 7
8 4 2 3
7 4 5
3 6
4 8 1
7 6 2 3
Hard #5
8 2 4
8
9 5
6 3 9 4 1
4 1 5 2 7
8 4
5 9 8 3
7 4 2
6 2 1 5
Hard #6
5 9 4 2 1
4
6 3
1 4 9 2
8 7 9 6
9 6 5
2 8
9 7 2 6
4 3 1 9
Hard #7
4 8 5 9
3 1 2 7 8 4
8 2 3 1
6 2
9 6 5 8
2
5 1 3
4 1 5 8
9
Hard #8
4 7 8 9 3
8 6 4 5
9 1 8
6 4
3 5 8 1
1 2 5 9
7
6 1 4
5 7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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