Printable Hard Sudoku

Set 1kpu9lc. 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
6 9 8
7 6 1
7 1 9
3 2 5
9 5 7 6 4
4 7
9 8 6
7 6 1 3
3 6 4
Hard #2
7 9 3 8 5
4 2 9 6 3
4 9
6 3 5 7
8 9 6
7 3 8
5
7 1 2
5 9 1
Hard #3
7 8 9
2 1 5
7 4 9 1 5
3 6 5
8 9 3
6
7 9 8 4
9 3 7 1
4 6 9
Hard #4
5 8 3
4 1 6
2 1
6 2 8 5
5 2 6 9
8 9 7
8 4
6 2 5 7 3
8 9 5
Hard #5
4 8 7 6
6 5
9 3 2 4
1 8
6 2
7 5 6 8
9 2 7 4
5 9 2
6 8 1 9
Hard #6
8 7 4 5
9 1 2 7
5 2 8 1
7 2 1 8
8 9
6 8
6 1 9
5 3
2 5 6 4
Hard #7
8 9 5 1
5 3 2
9 2 7
2 6 4 9
8 2
7 6 3
9 1 2 3 8 4
4 9
1 3
Hard #8
4 8 2 6 9
6 5 1 4
3 5
5 1 4 3 2 6
2 4 1
1 8
8
8 9 3 2
7 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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