Printable Hard Sudoku

Set ufb0ky. 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 5 7 8
3 6 2
7 3
5 9 1 4
7 3 5 2 9
6 1 5
4 2 9 6
3
2 7 4
Hard #2
4 6 1
5 9 8 2 3
3 6 5
6 8
8 7 3 4
6 9 4
2 1 9
2 1 5
5 4 2
Hard #3
4 2 1 8
7 9 2
5 2 6
8 9 5
1 8 3 6
1
5 3 1
2 3 4 6 7 5
7 4
Hard #4
8 6 7
6 9 1 4
9 4 5 8
9 4 7
6 1 8
8 2 4
2 7
7 4 5 2
9 3 6
Hard #5
7
5 1 4 3 9
7 6 4 5
1 9
4 8 7 6 5
3 2 1
3 5
5 9 3 8
7 8 4
Hard #6
7 3
7 6 3 4
5 8 7 1 3
9 7 1
1 3 6 9 2
6 5 9
3 2
9 1 4 7 5
Hard #7
1 9
6 2 1
3 9 1 7 4 6
6 4 2 5
2 7 9
5
4
3 2 6 9
2 1 9 4 7
Hard #8
2 9
5 3 7 8
7 8 9 5
2 1 8
6 3
6 7 4
1 7 4 3 9
7 6
9 8 1 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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