Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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