Printable Hard Sudoku

Set 3n4lk0. 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 7 3 6
9 2 1
1 7 9 8
4 9
1
8 9 1 6 2 3
8
5 6 3
7 9 2 1 4
Hard #2
3 4 1 2
9 6
6 7 3
7
5 6 9 3
3 1 5 4
7 3 5 9 6 8 1
1 5 4
2
Hard #3
7 2
2 9 5
6 1 4 2
2 3 9 4
3 5
8 2 7
2 4
4 5 9 1 3
7 4 6 8
Hard #4
2
5 9 6
3 8 2 7 4
3 1
6 2
7 5 4 3
8 3 7 1 2 6 4
1 6 8 5
9
Hard #5
2 1 8
3 4 1 5
4 3 7
8 3
6 9 8 4
4 1 7
7 9 1 3
5 3 4 2
9 6
Hard #6
9 6
1 7 9 5 2 4
5 4 6 7
4
3 7 6 1
6 5 2
4 5 9 8
8 2 6
9 8
Hard #7
8 6 2
1 8
5 3
1 3 4
4 6 9 5
5 7
1 8 3 6 5
4 8 3 2 7
2 7 6
Hard #8
9 5 3
2 6
1 9 2 5 7
7 1 6 5 2
9 1 6
4 2 5
7 1 8
4
6 4 8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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