Printable Hard Sudoku

Set 1spl68n. 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
8 3 1 9
2 1 6 8
7 8 2
3 4
9 2 5 6
5 3
1
7 1 5 9 3 2
9 5 6
Hard #2
6 8
9 1
9 4
5 8 4
3 8 6 4
2 6 7
5 9 8 7 2 3
8 5 6 7
7 3 1
Hard #3
7 5 4 2
9 7 1
9 5
4 3 5 9 6
3 6 5 7
4
6 7 3 8 9
5 3
9 2 3
Hard #4
4 2
7 8 2
3 7 6
1 6
7 5 1
6 4 8 2 7 5
8 4 2
9 7 1 6 8
5 1
Hard #5
1 7 3
2 6 8
9 4 1
7 3
6 5 2
8 6 1 9 5
1 8
8 2 4
5 1 4 6 2
Hard #6
3 9 7 4
5 2 7
2 9
4 1 7
3 2
8 1 5 4
5 8 4 1
3 1 9
2 8 6 7
Hard #7
6 1 3 2
8 7 1 4 9
2 3
3 7 4
7 4 2 8
5 2 4 8
8 5
2 3
1 2 9
Hard #8
3 1 9 8
6 2
8 4 7 6
5 6 8 9 3
3 1 5 6
7 1
7 8 3 4
9 8 5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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