Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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