Printable Hard Sudoku

Set o33yxh. 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
5 4 3 1
6 5
9 6 4
3 4
3 7 9 2
5 7 9
2 4 8 7
7 8 6 9
1 2 5
Hard #2
5 8 1
9 4 8 6
7 1
5 6 3 4
6 4
9 3 1 5
2 5 7 4
5 9 2
7 8 3
Hard #3
8 7 2
2 6 1 8 5
9 3
4 2 7 6
1 8
3 2 6 9 5
6 4 2
5 1
9 4 1
Hard #4
1 6
7 8 3 5
9 6 3
6 4 2 5
3 5 4 9
4 9 8 6
6 3 2
5
1 4 6 7
Hard #5
1 8 6
7 4 6 3
2 9 1
8 7 6 4 2
3 1 4
7 8 5
6 9
9 7 5
4 8 3
Hard #6
4 5 8
8 2
6 4 9 1
9 5 7
5 8 9 7
1
9 6 2
1 4 2
2 6 9 3 1 5
Hard #7
5 2 8 4
8 9
7 5 4
4 1 2 5 8
8 3 6
2 7
8 6 9
5 7 3
2 9 1 4
Hard #8
4 6 1
6 8 1 7
1 3 6
7 2 9 3
3
5 8 1 4
8 1 5 4
1 7 6
6 5 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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