Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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