Printable Hard Sudoku

Set 1wl0vfq. 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 5 9 2
2 6 4 3
4 9
9 4 1
5 4 7
8 7 5
7 3
9 7 3 8
3 1 2 5
Hard #2
4 8 9
6 9 7 4 5
9 2 6 1
4 8
2 8 9 4
8 7 5 6
8 2 9
6 7
9 3
Hard #3
9 8 2
1 9 4 6
4 7 8 1 9
8 7 2 9 4 5
3 7 8 9
1
9
6 1
4 7 3
Hard #4
5 9
9 7 3 6 8 4
6 8
4 5 2
6 2 7 1
1 9 8
2 4 7 9
4 2 6
1 9
Hard #5
2 5 6
7 3 8
7 1 5
2 6 5
7 4 9 6
6 5 8 4 9
7 8 4
3 6
9 4 1
Hard #6
9 2 4
4 9 7 1
6 4 5
5 3 8
8 1
9 7 2 5
8 3 9 6 4
8 9 2
1 6
Hard #7
7 4
2 1 9 6
6 9 8 7
7 5 2 3
5 3 4 1
4 3 2
8 1 9 5
1 3 2
4
Hard #8
5 4 1 9
1 8 5
2 6
1 8 2 3
9 7
1 6 4 2
8
3 7 4
6 2 7 4 5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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