Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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