Printable Hard Sudoku

Set p77au3. 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 7
9 2 7 6 8 4
4 2 8 1
4 2
3 1
2 1 7
6 9 2
5 1
7 6 3 1 5
Hard #2
3 9
1 6 9 8 7
2 8 9
4 7 5
6 3
7 8 2 6
7 4 8
8 3 1 7 2 4
2
Hard #3
5 8 1 3
4 2 9
3 8
8 6 1 4
9 3 4 2 7 6
7 5
2 5 6
5
7 8 4 6
Hard #4
3 8
9 1 2
5 2 7 3
6 2 8
7 1 5
9 1 7
6 5 8 9 7 4
8 5 9 6
3
Hard #5
6
4 8 6 7 9
3 5 1 4
1 4 7
9 5 7 3
2 6 9 8
4 3
4 1 9 5
3 5
Hard #6
3 5
9 7 3
8 1 3 7
8
1 7 8 2 4 5
6 5 3 4
2 1 7
4 5
2 5 9 4
Hard #7
8 7 6 1
9 1 6
1 2 5
9 3
3 4
5 2 6 3 9
2 8 9
4 9 7 5
3 7 1
Hard #8
7 6
3 8 6 9
9 6 1 3
2 3 9
4 7 2
6 3 7 8
6 5 3
7 8 3 5
6 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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