Printable Hard Sudoku

Set ds9io2. 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 6 9
1 8 9 4 5
6 5 1
8 3
5 4 2 1 7
7 2
4 7 3 8
2
9 3 1 4
Hard #2
9 8 4
1 4
4 3 2
8 7 2
6 1 5
9 5 7 8
7 3 8 6 4
1 7 8 9
2 6
Hard #3
2 5 4 3
7 9 5 1
6 7 8
1 2
7 8 6 4 5
8
6 7 1
5 1 8 2
9 5 7
Hard #4
9 3 1 2
5 1
4 6 2 8 7
8 1 3
9 6 4 2
3
4
8 9 7 4 1 3
1 6 8
Hard #5
8 4 5
2 8
2 8 6 9
5 2
7 3 6 9
1 9 7 4
2 9 7 3
5 7 9
3 6 5
Hard #6
8 2 4 9 7
7 3 5
5 3 6 2
6 2
5 6
4 2 3 9
9 2
8
5 9 7 8 2 1
Hard #7
2 4
9 5
7 3
5 7 6 9
5 7 3 1
4 8 1
8 1 6 5 7
5 6 2 4
1 8 3
Hard #8
2 7 4
8 5 1 3
5 6 9
2 6 8 5
9 6 8 7
4 3
9 7
5 6 2 9 8
7 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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