Printable Hard Sudoku

Set 8pqor3. 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 2 8 1
7
9 6 5 4
6 5
5 1 2 3
8 7 5 2
4 9 1
7 9
3 7 4 8 6
Hard #2
8 4
6 1 9 8 4
5 1 2
9 2 3 6
9 7
1 2
5 3
4 7 2 9 8
3 2 8 1
Hard #3
9 7 5 8 6
6 9 5
1 3 4 8
5 1 8
6 9 2
7 1 5
2 7
7 5 4
2 7 9
Hard #4
4 9 7
2 3 1
6
1 6 5
4 3 1 8
2 5 1
8 6 7 2 1
3 5 6 4
7 6 8
Hard #5
1 6 2 3 7
4
7 4 3 9
7 5 1
3 2 4 9 8
2 5
7 9 1
6 1
8 4 3 6
Hard #6
9 3 8
6
9 7 5 8 4 1
5 1 8 2 6
4
6 5
8 5
6 9 1
9 1 7 5 8 4
Hard #7
2 1
5 6 1 7 8 3 9 4
3 7
4 9
3 9 8
8 9 6
5 8 6 1
4 8 5
6 3
Hard #8
4 5 7 8
5 8 9 7 2
4 3
2 6 7
7 2 1
4 3
9 6 1
1 8
7 9 1 2 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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