Printable Hard Sudoku

Set 1wf1kqa. 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
4 5
1 6
6 1 4 9
7 9 8 6
9 4
6 2 7
8 9 1
5 7 1 6 3
8 3 4 5
Hard #2
7 1 6
5 7 2
3 5 9 7
4 8 3
4 6
2 1 3 4 6
4
3 5 2 9
6 7 8 3
Hard #3
8
7 9 8 3 2
6 2 7
3 1 4
5 4 3
5 7 2 6
6 5
4 9 8 6
2 3 4 8
Hard #4
6 4 9 8
3 7 2 9 1
9 7 1
2 3 1
4
4 5 2 6
6 5
7 6 9
3 8 5 9
Hard #5
2 8 9 1 4
4 6 1 5
2 8
1 6 8
3
2 9 7 3
3 4
9 2 4 8 7
7 2 1
Hard #6
5 9 1 3
7 2
2 8 3 1
1
8 7 4
6 5 9
8 3 5
9 8 7
2 9 7 1 4 6
Hard #7
8 4 9 5 6
3 1 6
4 7 9 2
6
1 8 4
2 5 4 1
4 7
9 7 1 5
7 3 8
Hard #8
7 3 1
1 9 4
5 6 2 8
2 9 8
6 4 9
7 3 1
8 4 2
9 1 7 6
2 1 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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