Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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