Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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