Printable Hard Sudoku

Set 1lp1obk. 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
5
2 4 5 6
8 1 9 5 7
6
6 7 1
1 3 2 5 6
5 7 4
4 6 2
7 1 9 8
Hard #2
9 1 2 6
5 4 8
4 8 6 3
2 8
1 7 4 2
9 4 3
5 6 1
5 9
6 7 5 2
Hard #3
1 4
4 5
5 7 8 3 4 1 6
8 2 5 1
9 6
3 8 5
3 6
6 7 8
2 1 4 9
Hard #4
6 4 7 2
1 8
3 8 5 6 7
3 6 2
4 8
5 1 9 4 6
3 8 1
4 3 1
7 2
Hard #5
8
6 1 4 2
3 9
5 1
4 5 2 1 3
1 8 3 4 7
7 2
3 9 6
7 8 2 6 5
Hard #6
7 3 5 2
5 9 8
2
1 5
3 5 6 9
6 3
7 1 8 9 4
9 2 4 5
4 8 1 7
Hard #7
9 2 8
3 9
7 5
9 4 6
8 6 4 1
4 7 5 6 8 2
4 8 5
9 7 3
5 3 7
Hard #8
1
9 6 3
5 7 6 4
7 8 9
8 4
5 1 3 7 8
9 5
7 1 2
5 6 3 2 4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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