Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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