Printable Hard Sudoku

Set 9tby1k. 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
1 4 8
3 1 6
8 4 9 7
7 3 5 9
6 4 8 5 2
3 6
9 5 3
6 4 2 5
2
Hard #2
3 4
4 7 3
7 6 9 1
7 4 2 5
2 3 7 8
6 4
2 3
7 1 8
5 1 8 6 7
Hard #3
9 8 5 1 4 2
6 2 5
9 3
7 1 6
4 2 1
8 4 9
1 5 9
9 1 3
3 7 2
Hard #4
4 7 1 8
2
8 9 7 6 2
5 4 6
7 5 3 2
9
9 2 1
8 3 1 4
6 5 8 9
Hard #5
8 2 1 7
9 4 8 6
4 9 1 5
9 3 6 2
9 4
5
2 6 9 4
7
4 7 6 8 3
Hard #6
9 1 5
5 4 1
4 9
6 5 9 3 8
2 3 7 1
8 2
1 7 4
4 9 6 3 8 7
2
Hard #7
9 5 2 1
1 3 6 7
8
3 8 5 9 4
9 4
2 6 7 8
1
4 9 8 7
8 6 2 5
Hard #8
5 1 7 6
5 9 1
6 2 4
4 7 9
1 6 2 7 8
3 6 4
2 5 6 1
3 1 5
3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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