Printable Hard Sudoku

Set 1pp9rs9. 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
2 4 8 5 7
6 5
9 1 8
7 1 9
3 4 8
1 6
3 7 6 4
9 1 4 2
2 9 3
Hard #2
4 9 2
9 4 6 1
2 5 3 9 6
3 2 4 1
5 2 7
3 7 4
6 2 3 9
9 7 8
Hard #3
7 2 5
4 6 1 2 9
8
7 8
6 4 5
1 3 9 6 4 5
1 6 5 2
7 6
5 1 3
Hard #4
4 8
2 3 8 1 5
1 5 2 6
2 5 3 4
7
8 9 7 6
4 9 8
2 5
5 1 4 7
Hard #5
6 3
7 5
4 8 9
1 8 7 2 4
7 5 9 1
5
4 9 7 6
2 8 3
1 9 2 4 8
Hard #6
8 4 1
1 7 5
4 5 9
7 1 9 3 6 4
6 9 3
2 9 7
5 6 3
2 8 9
8 6
Hard #7
6 9 2 8
5 8 9
8 1 3 6
5 6
9 1 4 5 6
3
3 8 2
3 8 1
7 5 8 6
Hard #8
7 3 9
2 7 8 4 1
4 7
3 8 5
1 2
3 9 6 5
2 9 1
2 6 7
8 6 9 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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