Printable Hard Sudoku

Set ei0ckv. 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
8 4 1
9 6
2 4 9
1 2 7 4
9 3 6 1 8 5 4
8 7 1
7 8
6 5
9 1 4
Hard #2
9 1 2
8 7 1 5
5 2 7 4
6 2
4 9 8 7
5 6 2
3 8 1
1 7 9
6 8 3
Hard #3
4 9 2
7 6 9
3 8 1 6
3 6 8
5 8 2
1 5 9
6 9 4 5 7
5 7 6
7 8
Hard #4
6 1 5
9 4 5
7 3
1 2 8
7 6 4
5 9 3
4 6 3
9 3 6 2
3 2 9 8 5
Hard #5
5 9 8 6
6 4 5
3 6 9
9 3 5 8
3 4 6 2
8 3
5
7 5 2 4
6 5 1 2
Hard #6
2 1 7 9 4
8 9
9 3 1
3 4
9 6 5 7
6 1 4 2
4 8 3
7 1 9
9 2 5
Hard #7
9 7
5 6
2 7 3 9
2 3 4
4 7 1
8 9 5 7
8 5 4 9
6 7 3 1
8 9 2
Hard #8
5
1 5 8 9 4
7 8 4 3
9 3 7 1
4 8
1 2 8 5
3 7 6
2
9 4 3 6 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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