Printable Hard Sudoku

Set 1lib7rr. 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
9 3 8
4 7 3 5
1 2 8
1 3 2 5
9 3 1
6 1 7 3
6 7 5 4
9 8
5 4
Hard #2
9 8 6 4 2
3 7
5 1 3 7
3 8 4 1
1 5 2
6 8
3 1 6
7 2
9 7 8 1
Hard #3
2 9 6 4
1 7 5 3
6 4 7
4 8 3
1 2 8 5
2 9
9 6 2 7
7 6
8 5 1
Hard #4
7 6 9
8 5 2
3 1 6 5
5 9 2
1 2 3 8
4 2 1 3
5 8 1
4 2 5
7 6
Hard #5
4 5 7
7 9 2
3 1 6 9 5
5 7 8 9
3 6 7
7 2 4
4 6 3 5
8 2 3
8
Hard #6
3 6 2
6 9 7
5 2 9 8
2 5
7 5 3 2
4 8 9
2
9 8 6 4 7 1
6 1 2
Hard #7
6 1 4 3
5
9 8 6 4 7
1 2 9 4 5
7 8 9
5 4 1
4
3 1 9 2
7 2 3
Hard #8
6 7 5
2 3
5 8 7 6 4
2 5 4
1 9 3 2
6 1 9
8 7
9 2 7 6
6 9 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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