Printable Hard Sudoku

Set 18cm3gc. 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 1 2
2 9 7 8
9 4 6
8 3 6 2
6 7 8 9
5
5 2 3 1
4
1 4 6 5 9
Hard #2
9 5 1
5 4 3 1 8
9 2 3
5
1 3
3 2 4 9
1 3 4 8
8 4 9 7
7 2 9
Hard #3
5 7 8
6 9 5 7 2
1 3 4 6
8 6 9
4 8 3
3 1 7
6 7 3 9 1
4
3 8
Hard #4
2
5 7 2 1
1 8 3 9
9 3
8 3 9
6 9 2
9 5 6
6 3 7 2 5
5 1 8 3
Hard #5
9 2 3 5
4 6 1
3 4 7
5 3 1 6
7 5 1 3
7 8
4 6 1 5 7
8 6 4 9
Hard #6
3 2 4
4 9 3 2
9 1 6 5 7
4 7
6 7 4 2
9 8 7
3 7 5
9
9 2 3 1
Hard #7
9 8
3 9
3 6 5 2
1 5 6 3
4 5 7
8 6 3 9
7 1
4 6 2
9 7 6 4 5
Hard #8
6 5 4 9
2 7 1
2
7 3 1 8
2 3 9 7
8 5 3
7 3 5
3 6 9 2
4 1 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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