Printable Hard Sudoku

Set 3n2zbl. 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
2 8 7 5
1 9 8
5 9 3 1
6 4 5 3
9 6 4
4 3 1 9
2 1 3
4 5
2 8
Hard #2
6 3 9 1
4 5 6
1 4 2
7 4 3 2
1 6
9 8 3 7 5
8 3
3 2 8 4
6 3
Hard #3
6 9
2 4 8
4 8 9
8 3 7 6
6 7
3 1 4 9
7 2 1 5
3 5 2 8 1
1 3
Hard #4
4 5
1 2 5 6 4
7 2
8 9 6 5 7
3 6 7 9 8
4 1
7 2 3
8 4 1
4 9
Hard #5
8 7 2
4 8
3 4 1
5 4
4 7 8 2 6
2 5 3 6 1
3 8 2
3 8 6 5 9 7
Hard #6
6 8
4 8 2 6
5 1
8 5 9 2
1 6 5
7 2 5 8 1
8 5 7 4
7 3
6 3 8
Hard #7
4 5 6 7
5 7 6 9
4 5 8 1
3 8
4 7
7 1 9 3
6 9 1 3
3 5 7 6
8
Hard #8
9 2 6
1 3 7
6 2 8
3 4 5 1
8 6 5 3
4 6
3 9 8
8 1 6
7 9 8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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