Printable Hard Sudoku

Set 1dhlu7g. 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
6 8 7 9
4 5 2
4 7
3
2 1 8
9 5 8 6
3 2 5 1
2 5
5 9 8 4 6 3
Hard #2
9 8 6
3 5 8 9
6 5
9 7 5
1 5 3 2
4 1 3 7
8 5 9
1
6 2 1 7 3
Hard #3
4 8
8 3
2 1 4 7
3 6 8
6 9 3 2
1 8 9 5 4
4 3 8 1 5
5 1 4 6
Hard #4
2 6 7 1
8 4
4
7 2 3 1 9
2 3 5
6 2 1
2 3 7 5
6 5 2 9
8 1 4
Hard #5
4 9
2 3 7 1
6 7 4 8 2
9 4 2 5
8 3
4 6
5
3 2 5 4 1
9 8 2 3
Hard #6
1 6 3 8 7
5 8 6 3
3 6 4
9 2 7 6
6 4 2 5
1 9
8 2 7 6 3
5
7
Hard #7
8 1 7 9
3 1
9 3
2 3 5
5 6 1
1 4 9 5 7 3
2 3 4 8 1
3 8 5 6
Hard #8
3 9
6 1 2
4 5 9 7
3 7 6
7 2 8
9 5 1 6 3
3 8 6 2
8 5 1
5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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