Printable Hard Sudoku

Set 1c80zre. 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
7 8
9 1 6
8 7 1 9
1 7 3 6
2 6 8 9 1 5 7
9
5
5 2 3 6
1 7 9
Hard #2
9 2 7 6
7 8 6 2 1
4 5
3 5 1 6 7
5 3 9
1
7 6 5
8 4 5
9 8 2
Hard #3
2 4
8 5 3 7
3 1 5
6 1 2 8 9
5 1 8 2
4 7 1
8 1 3 2
4 9 6 1
Hard #4
3 8 4
6 9 4
6 2 3 9
9 3 1
5 1 6 9
3 4 8
7
5 7 2 6 8
1 5 2
Hard #5
3 1
4 2 6 7
5
8 3 7 1
6
1 2 5 4 3
5 7 3
9 6 4 7 1 8
3 9 6
Hard #6
9 6
3 2 8
6 1 5
7 3
8 4 2 1 5
3 6
8 9 7
8 3 5 4
1 9 7 8 5
Hard #7
6 1 8
7 8
2 5 9
8 4
4 5 6
3 6 9 2
8 7 2 6 1
9 4
6 8 5 2 7
Hard #8
7 2 8
8 3 7
4 9 5 1
5 2 8
2 6 4
2 1 5 4
1 3 4 6
8 1 2 7
3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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