Printable Hard Sudoku

Set ys0uj0. 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
5 2 1 6 7
3 5 6 1
9 6 4 7 2
6 4
1 2 3
9 6 7
3 9
5 1 2
4 3
Hard #2
7 6
3 1 4 7 5
4
6 8 3 2 4
4 3
9 1 2 8
5 4 9
8 2 6 5
9 5 2
Hard #3
1 7 2
2 7 4
3 9 5 6 7
1 3 9 5
4 7 3
3 2 6
9 2 1
4 1 9
8 4
Hard #4
7 6 9 3
8 7 5
5 2 4 9
2 9
9 4
5 7 4 2 3
1 9 3 6 2
3 5 1
7
Hard #5
9 5 4 1 6 7
6 9
4 6 8 3
8 6 2 1
4 7 5
1 3
1 2 8 3
2 8
9 2
Hard #6
3 8
1 9 5 6 8 7
8 6 9 4 2
7 5
9 3 1 6
6 2
4 1 3 8
3 5
2 7
Hard #7
8 2
2 4
7 1 9
6 4 5
8 4 3 9 1
1 6 8
6 9 7 2
7 6 3 8
5 8 6
Hard #8
6 7 2
5 6 1
1 3 2 5
7 5 8 4
3 8
9 7 6 1
4 3 6 1 9
6
9 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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