Printable Hard Sudoku

Set 1p4m9a9. 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 7 6
5 3 8
6 1 3
5 2 6 3 8
7 5
3 8 5 1
3 6 5 2
1 8
6 9 7
Hard #2
6 3 7
3 2 7 8
4 5 3 6
8 3 7 5
2 4 7 8 9
9 6
4 3
2 1
9 1 4
Hard #3
8 5 4
1 8 2
3 5
4 3
2 3 9
7 4 5 2 6
2 1 4 8
6 7 4
7 8 2 9
Hard #4
2 6 5 1
8 4
1
7 1
5 3 9 8 7
8 6 7 5 4 3
5 2 9
9 3 6
1 6 7
Hard #5
8 7
1 4 6 9
7 1
8 5 6
3
5 2 1 9 8
5 4
3 9 4 5 1 8
1 4 6 2
Hard #6
6 2 8 4
3 6 2 5
8 3
4 1 6 7 2
7 4 8 5
1 7
9 1
5 9 8
4 5 3
Hard #7
3 4 1 7
6 3
6 3 2 8
1 8 7 6 9
5 2 7
6 9 2
9 3 4
4 7
2 9 5
Hard #8
8 2 6
6 9
5 9 7 4
7 6
3 4 6 8 1
1 2 8
6 2 5
2 9 8 7
3 9 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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