Printable Hard Sudoku

Set h7d2ko. 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
6 5 2 7 4
2
9 3
4 1 3
3 5 1
9 7 3 8
5 2 1 6
3 7 9 2
9 3 8
Hard #2
6 5 7
7 2 5
3 6 9 1
7 1 8 6
4 7 5 2 8
5 4
6
8 6 9
8 7 3 2
Hard #3
9 5
6 7 1 2
5 4
8 6
3 7 1 9
7 1 3 5
3 4 7 1 9
8 5 3
2 8 5
Hard #4
1 5 2 9
3 9 8
7
1 8 2
7 4 3 6
4 5 8
2 4 3 5 8
5 8 6
8 1 3
Hard #5
6 9
5 6
1 7 5 9
1 4 3
5 9 8 4
2
7 2
9 8 3 1
7 8 1 6 4 2 3
Hard #6
6 2
9 6 5 4
5 3
8 9 4 3 5
5 2
7 9 4
5 8 3 6
2 8 7
1 6 2 4
Hard #7
2 3
5 6
4 5 6
7 3 9
6 8 1
9 5 3 6
2 9 3 1
5 4 8
8 1 2 7 9
Hard #8
2 3 4
1 4 5 8
7 4
1 4 8 6
5 7 2 9 6
4 2
5 8 7
8 7 3 9
6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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