Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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