Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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