Printable Hard Sudoku

Set 1h99cxa. 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 1
2 1 9 4 8
2 7
5 9 8
4 2 5
7 2 3 9 1
3 4 7
4 5
6 3 1 4
Hard #2
3 9 8 5
2 1 3 4
9 5 6 1
2 7 6
6 2 5 3
4 6 8
3 7
6 5 4
9 3
Hard #3
2 1 7
5 7 2 4
6 1 8 3
2 4 6 3
5 2 9
1 5 8
4 6 7
9
7 3 5 4
Hard #4
3 1 8 2 5 9
7
7 6 3 1
2 6
8 6 4
9 1 2
9 5 8 7
3 4 2 8 1
2
Hard #5
7 5 1 3
8 3 9
9 6
9 2 4
5 6 1 2
5 7
6 7 8 9
9 2 5
2 9 7 1
Hard #6
7 3 8
2 3
8 4 1 5
9 5 7
1 4
7 6 2
8 3 7 6 9 4
6 2 9
5 6 3
Hard #7
2 8 3
9 8
7 4
5 9 1
7 2 5
9 7 1 4
3 4 8 9 2 1
1 8 6 7
7 4
Hard #8
4 1 2 6 7
3 5 6
7 3 1
1 5 3
7 6 2
8 1
8 2
5 2 8 3
4 3 6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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