Printable Hard Sudoku

Set ayy6xe. 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 6 2 1
9
1 6 5 3 4
6 7 4
9 4 6
5 2 8 7 4
4 3 8 7
8 3
8 9
Hard #2
5 7 3
3 8 9 5 1
4 1 6 3
1 5 2 6
6
7 8 9
2 7 9 4
1 2
5 4 7
Hard #3
6
1 3 5 4
2 3 7 8
9 8
7 8 4
6 9 2 7 4
3 8 9 1 5
9 7 5
8 2
Hard #4
6 9 1 8
4 9 3
3 2 6
8 7 9
8 7 9 6 1
9 3 4
6 5 1
3 4 1
3 6
Hard #5
9 6
5 8 6 3
6 4 3 9
6 7 5 1
3 4 2 7
6
8 9
3 2 1 7 4
5 8 6
Hard #6
1 8 5 9
7 6 1 8
2 9
7 2 3 6
5 4
8 1 2 3
2 5
5 4 9 2
8 3 7
Hard #7
4 3 1
8 6 9 1
3 1 4 2
7
5 8 4 3
1 2 6
6 4 9 1 5
5 9
9 2 4
Hard #8
7 1 3 6
5 8
3 4 7
5 6 9
3 5 8 9
6 1 9 3 2 5
4 6
2 3 4
8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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