Printable Hard Sudoku

Set 2j9j6n. 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
3 5
2 8 3 6 9 1
2 5
8 1 7
5 3
2 1 3 4 5
7 3 1 8
9
1 7 2 4
Hard #2
7 2 5 4
4 3 1
5
2 8 5 6
5 6 8
6 9 3 2
1 7
1 8 3 5
3 7 6 9
Hard #3
2 9 5
5 9 3 2
9 8 6 7
9 1 4 5
4 6 8
3 1 9
8 1 9
6 1
7 9 3
Hard #4
7 1 2 8
6 3 5
8 7 4 9
2 3 5 8
9 6 4
3 1 7
8 1 5 9
4
3 5 2
Hard #5
2 4
9 5 6 2
1 6 3 5
7 4 8 2
1 2 4 3 7
8 6 4
4 7 8
4 6 9
5
Hard #6
9 5 2
6 7 3 9
5 8 1
4 1
3 1 7
9 7 4 8 2
9 2 7 3 4
4 6 2
6
Hard #7
2 3 9
9 1 8
6 9 5
4 8 1 3
8 5 6
8
1 4 2 3 6 7
8 6 2
3 2 1
Hard #8
1 6
4 3 7 8
5 2 9
9 6 1 7
8 4
3 7 6 4 9
9 3 7 1
1 4 5
7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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