Printable Hard Sudoku

Set apx6uq. 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 5 9 6 8
5 7 1 8 2 9 3
2 7
3 7
6 4 9
5 3 4
4 7
9 5
8 2 1
Hard #2
8 1
6 3 5 1 9
2 6 3 4 7
6 3 7 1 9
3 7 1 8
9 5 6
9
3 5 2 7
Hard #3
3 4 5
7 6
3 4
2 9
4 7 3 2 1
7 8 9
8 1
8 2 4 5 1
5 4 9 6 7
Hard #4
7 9
4 6 7 5 8
6 8
9 8 7 5
2 8 3 1
2 6
4 1
9 5 7 3
3 7 9 4
Hard #5
5 6 2
1 8 6 3
6 4 5 1
9 6 4
3 5 1 9 6
2 1 3
9 4 8
6 3 5 2
Hard #6
4 3 2 5
2 1 3
5 4
9 2 1
1 3 5 6
4 1 7 2
7 2
6 2 9
7 8 5 3
Hard #7
7 1 2
3 6 5
2 3 9
1 8
1 3 4 8 5
5 3 4
5 4 2 9
6 7 5 8
4 3
Hard #8
1 3
3 1 5 7 6
7 6 2
8 2 5
8 9
9 7 2
9 6 5 1
1 7 9
5 1 3 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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