Printable Hard Sudoku

Set p7rzs4. 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
1 8 7
7 2 5 1 3
1 8
7 1 2
5 3 1
6 1 5 9 4
3 4 9 6
4 5 2
8
Hard #2
7 2 8
6 5 9
1 5 2
7 5 4 1 6
9 8 5
4 6 8
2 9
6 3 7 1
1 8 7
Hard #3
3 4 6 8
1 4 8 7
3
2 7 6 5
8 3
4 8
5 1 6 7
9 2 8
6 5 2 4 9
Hard #4
8 3 2 9 6
2 9 4 8
8 5
4
9
1 4 2 3 7
3 1
9 2 5 8 1
7 9 6 2
Hard #5
3 4
4 8 7
6 5 3 4 9 8
8 6 9 2
9 1 6 3
3 8
2 7
2 4 1
9 1 5
Hard #6
4 7 2 6 8
8 6 4 9
7 4 2
2 5
3 1 9
9 5 1 7
2
6 9 7 5 1
5 4
Hard #7
1 6
6 5 3
3 2 8 1
8 6 7
8 4 7 5
5 7 4 9
2 6 9
4 5 2
1 4 3
Hard #8
6 8 2 9
2 7
5 9 7 2 4 1
2
7 2 1 3 8 5
3 4 6
5 9 8
8
4 5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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