Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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