Printable Hard Sudoku

Set 1lp129m. 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 2 6 3
6 4 7 1
4 9 8 6
2
5
6 5 1 7 4
7 6 9 1
2 1
4 8 5 7
Hard #2
9 5 6
9 3 5
7 2 8 9
9 4 3 1
1 8 9
7 8 4
3 4 2 5
6 2 8
5 4
Hard #3
6 4 3 5
8 9 7
3 5 2
5 6 2 8 1 4
3 8
1 8 6 3
2 8
9 6 4 5
4
Hard #4
3 2 4
1 4 9
8 5
7 3 5
6 2 3
9 3 2 7 6
5 2 7 8 3 1
8 9
5 3
Hard #5
8 4
1 5 4 7 3
6
1 7 2 9 6
2 9 5
1 3
9 3 4 8 1
5 9 3
7 2 5
Hard #6
5 3 8
8 1 6 7
4 1 6 9
9 2 1
8 1 7 6
8 4
6 4
6 9 4 7
1 4 9
Hard #7
5 1 3
6 8 2
1 4 5 3
3 9
9 6 5 4 8
8 9 7 3 5
6 4 9
5 1
7 8
Hard #8
4 2 8
4 1 9 5
6 7 1
7 2 4 9
8 3
9 5
6 9 8
3 5 4 2 7 6
7 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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