Printable Hard Sudoku

Set 1mxsn0o. 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
4
5 6 2 9 7
6 1 8
2 3 9
6 8 9 7 3 1 4
3 2
1 7 5
1 5 7
4 8
Hard #2
1 7 9 6
9 6 7 2
4 5 1
8 3 2 4
3 5
9 4 7 2
3 2
1 2 6 7 9
4
Hard #3
6 9
4 3 8
5 3 8 2
1 4 6
6 4 7
8 6 7 2 1
7 8 1 4
5 2 7 1
9
Hard #4
2
5 4
3 7 2 6
6 1 4 3 7
5 8 1 6 2
4 1
2 8 7 3
6 1
7 6 9 5
Hard #5
8 6
7 2 6 9 4
4 3 2
8 1 3 9
3 2
6 5 9
3 7 6 2 1 4
8 7
9 8
Hard #6
2 6 1
6 2 1 3
5 8 4 2
3 8
1 7 5 9 6
5 9 7
2 8
6 3
5 8 7 2
Hard #7
2 5 4
3 2 8
5 4 1 2
1 2 3 7
7 9 1
6 4 9 1 2
8 6 1
3 5
7 2
Hard #8
8 1
5 9 3
1 8 2 4
5 2 8 6
9
8 6 3 4 2
6 4 7 8 9
7 3 1
6 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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