Printable Hard Sudoku

Set 16da9jl. 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
5 7 1 6 3
3 4 7
6 1 7 8
8 5
2 6 7 9
3 7
2 6 5 9 3
4 6
3 1
Hard #2
3 6 5 7
1 7 3 4 9
4
3 9 5
7 6 2
8 2
1 8 3 7 6
8 5 3
9 3 4
Hard #3
2 7 1
8 9 5 2 6
3 1 5
7 5 9
2 3 9
4 9 7 8 3
6
7 5 4
2 8 5
Hard #4
9 2
9
2 1 7
8 3
2 7 4 8
8 6
4 2 6 1 8 5
6 8 2 1
8 3 5 4 6
Hard #5
3 6 8 2 7
4 2 7
5 7 8
7 1 8 6
5 1 2 6 3
9
6 9
3 1 2
6 4 1
Hard #6
8 3 1 7
6 2 1 3
1 9 4
8 5 4 6
6 4 5
2 3
6 5 3
5 3 9 4
2 9
Hard #7
8 3
8 1 7 3
4 1
4 2
5 7 6 2 8
2 5 7 4
7 2 1 9 6
1 5
9 2 8
Hard #8
2 6 9
6 9 7 8
1 9 7
9 3 7
3 7 6 4
9 7 5
2 4 1 8
3 6 2
8 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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