Printable Hard Sudoku

Set 1ucl7qw. 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 6 2 3
3 5
7 1
2 8 6 1
4 9 2
5 7
6 9 7 8 4 5
5 9 8 4
5 4
Hard #2
6 5 1
8
3 2 4 5 8 9
4 1 7 9
2 5
3 9
7 6 1 2 4
3 1 6
1 4 2
Hard #3
4 6 3
9 7 8 5
1 8 4
5 4 3
1 7 6 2
2 3 1
7 9 1 3 6
5
5 7 8
Hard #4
5 2 1 8
8 6 5 3
3 8 4 7
3 2 5 1
7
2 1 4 7
7 3 9
2 5
9 3 8
Hard #5
7
8 3 1
4 8 3 2 7
7 2 1
2 4 9
4 5 1
5 3 2
9 8 4 6
6 2 7 5
Hard #6
6 5 8
1 2 3 4
4 3 2
8 1 2 7
3 8 1 6
9 5 7 8
2 4
9 7
7 5 1
Hard #7
1 4
1 4 9 6
5 3 1
8 3 7 2
5 6 4 9 8
4 2 3
9 7
2 5 7
7 2 1
Hard #8
1 8 5 3 7
6 8 1
5 8 1 9
6 3 1 4
4
7 8 6
1 3 4
6 8 7
4 1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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