Printable Hard Sudoku

Set 1l16ilt. 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
7 1 4 6
1 2 4
8 7
9 2 5 1
7 9 8
4 9
4 3 7 8
7 5 4 2
8 7 4
Hard #2
5 4
6 9 4 1
8 1 2
9 8 1
5 3 9 2
7 1
4 1 3 7 9 8
6 3
3 7 2
Hard #3
8 1 7
7 9 4
9 6 2 1
7 5 9 8 6
2 3 5
5 1
1 8 2
9 3 5 6
7 8
Hard #4
4 2 3
1 5 6
3 9 4
9 1 5 4
5 7
2 9 8 7
5 3 9
3 1 2
5 2 7 6
Hard #5
4 5
2 6 3 8
5 1
5 6 3 9
1 8 5 6
3 2 8 5
1 8 6 4
6 8 9 7
5
Hard #6
3 6 7 5 9
8
9 2 4 3 7
5 2 8 4
9 7 5
8 4 3
4 9 5
5 2 8
7 4
Hard #7
6 7 2
4 6
5 6 2 1 8
1 9 7
5 7 6 9 3
6 5
5 9 6
8 5 1 4
2 3
Hard #8
1 9
7 6 4
3 8 5 4
9 6 4 3 2 8
8 1 2
3 2 7 6 1
1 2
3 6
4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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