Printable Hard Sudoku

Set hna5by. 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
3 1
8 3 9 5
9 2 7
5 7 4 1
9 8 5 2
4
8 1
1 7 9 5 4
6 5 7 8
Hard #2
5 9 4
4 3 1
1 5 2
2 4 5
3 4 1 8
7 3 5
1
5 7 8
7 8 6 3 4 2
Hard #3
1 4
4 9 1 2 5
2 5 3
5 6 1
3 5 7
9 1 5 4
1 7
8 9 6 3
5 3 2
Hard #4
3 1 9
4 2 1
7 6 9 2 5 3
7 8
5 1
1 6 8
1 6 9 3
6 1
7 4 5 2
Hard #5
1 7 3
4 8
5 8 4 9
5 8 4
2 6 8 1
3 1 4 5
9 2 1 6 4
7 1 5
2
Hard #6
6 1 5 8
7 4 8 6 2 9
2 9 8 4
2 7
2 3 1
5
4
4 5 9 6
5 8 1 4
Hard #7
1 7
6 7 1 3 9
9 3 4 2 6
6 1 8
7 3
2 4
6 2
1 9 8
5 4 6 9 7
Hard #8
7 9 6 4
8 5 9
3 6
1 6 5 4 9
8 3 2
6 3
5 7 3 9
8 5
6 4 1 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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