Printable Hard Sudoku

Set r6l7rj. 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
2 6 8 1
6 3 1 5
3 9 2 7
4 3
2 7 4 9
2 8 7 6
9 5 1 3 2
2 1
Hard #2
1 2 5 7
8 6 7
7 4 3
1 2 9 4 5
9 5 2 4 8
3
1 2
8 7 4
3 5 8
Hard #3
2 8 9 5
4 5 8
5 7 2 6
5 2
8 5 4 7
4 1 8
3 1
6 3 7
7 6 5 2
Hard #4
6 9 5 2
3 1 8 6
4 7 9
2 6 5
3
5 7 8 1 2
1 7 3
2 4 8 5
6 1
Hard #5
1 5 6 9 7 4
7 5 6 3
8 1
4 7
6 5
8 3 7 9
4 5 9
8 9 2
2 3 8
Hard #6
5 7 6
3 6 7
6 2 5 3
5 6 3 9
8 4
6 7 3 2
7 4 9
6 4
3 2 1 8
Hard #7
4 9
5 4 7 2
3 7 8 2
2 9
6
9 8 1 5 7
6 5 4
7 3 1
4 3 8 6 9
Hard #8
7 1 4
4 5 9
5 3 2 1
6 3 5 8
9 6 7 4
7 1 6
1 8 5
9 1
4 3 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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