Printable Hard Sudoku

Set 1l1pokp. 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
5 2 6
4 8
3 6 9 1
5 3 6 8
7 8 4 9 2
8 3 6 7 5 9
9 1 7
2
Hard #2
6 7 1 5 3 4
8 2 7
9 6
4 9 2 5 6
3 2 1
2 9
1 9 8
7 5 8 2
2
Hard #3
6 3 5
3 8 2 5 6
2 1
4 5 8 7
3 9
7 9 1
6 9
1 2
2 9 3 4 1 8
Hard #4
1 8
9 3 6
4 9 5 1 7
6 5 8 1 4
6
3 9 4 5
5
9 3 7 8
7 8 5 4
Hard #5
6
9 7 4 3
8 5 1
7 5 2 1
9 6 2 7 4
2 1 7 6 9
1 8
5 8 9
2 3
Hard #6
2 5
6 2 5
5 3 9 1
3 9 8 6
1 4 3 5
2 9 4
4 8 7
6 1 5 8
8 3
Hard #7
6 2
5 7 8
3 8 4 7
7 3 6 5
5 9 4
1 9
4 5 8
5 1 7 8
1 3 9 6
Hard #8
7 4
8 4 3 7
8 6 5
3 1
2 4 5
6 9 2
6 7 3
9 4 1 2 7
7 6 2 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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