Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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