Printable Hard Sudoku

Set wl2uzw. 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
3 7
9 4 8
4 2 1
8 1 3 6
9 7 2 1
4 8 9 7
2 3 6
7 4 3
6 5 7
Hard #2
5 7 2
3 4 5
6 3 1
4 1 2 8 9
8 6 5
5 3 4 1
8 4
6 5 3
2 7 6
Hard #3
6 8 3
1 5
5 4 9
9 3 2 1
5 2 6
3 7 9 8
1 7 9
7 6 2 4
6 8 5
Hard #4
8 5
2 1 8 6 7
9 4 1
7 9 5 2
8 3 4 7
8
5 4 2
2 1 4
6 1 2 3
Hard #5
7 9 5
6 2 7
5 3 6 1
8 4 7 9
1 2 4 8
2 7
7 6 9
3 2
4 2 8 5
Hard #6
5 1 2 4
1 9 8 6
3 4
5 7 4 3
5
4 6 9 2 8
4 1 6
1 7 4
3 8 1
Hard #7
8 1 5
3 9 5 7
4 7 6 8
7 4
2 6 4 7 1
3 1 7 2
8 5
9 3
8 2 1
Hard #8
4 9 1
7 2 6 1 3
6 5 9 7
2 1
9 6 5
7 2 3
4 3 5 9
4 6 8
4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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