Printable Hard Sudoku

Set lr6fhj. 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 3 4
4 6 1
9 3
3 7 6 1 8
2 8 6
1 7 5
9 8
6 5 7
8 4 2 3 9
Hard #2
2 1 9
5 3 9 8
8 7
9 3 6
7 6 8 5 9
9 7 3 4
2 4 1 9
7 2 6 8
Hard #3
3 9
6 9 1 7
2 1
7 6 2
9 5 4 8 7 1
8 3 9
3 4
3 5 8 7
8 7 9
Hard #4
9 3 1 8
6 7
8 4 7 5
7 1 6
5 4 6 8
3
5 4 1
6 2 4
3 2 1 8 7
Hard #5
1 9
4 2 8
1 5 6 8 4
9 3 1 7 6
1
6 7 2 9 8
4 5 3
7 4
3 5 8
Hard #6
4 9 3 8 5
5 1
2 6 1 4
3 4 8
8 9 2
5 3
5 7
6 2 8 1 5 4
8 2
Hard #7
6 9
8 1 7 2 5 4 3
3 8
8 9
9 7 1 5
4
2 4 6 1 8
3 6 9 7
8 4
Hard #8
2
1 9 4 2
7 8 5
6 4 7
8 1 6 4
4 3 9 8
5 3 6 4
3 2 4 7
4 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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