Printable Hard Sudoku

Set 1qu5yo2. 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
8 3 5
7 5 3
4 1 7 2
9
4 9 1
6 8 9 1
6 5 3 1
9 2 4 8
8 9 7
Hard #2
3 1
7 3 4 8
5 4
6 4 1 7 5
4 2 9
5
1 2 8 7 3 4
7 8 3 9
6 2
Hard #3
2 1 5 7
6 9 7 8
6 4
9 6
7 3 1 8 2
2 7 8 3
8 3 9
9 2 1 3
8
Hard #4
4 9 6
2 4 1 7
8 3 1
6
1 9 5
8 7 4 5
5 1 4 8 9
3 8 9 2
6 5
Hard #5
5 2 9 7
3 7 6 9
8 3 7 2 4
1 7 6 8
6 9 1 8
8 7
6 7 3
3 5 2
Hard #6
5 7 2 1
7 4
1 3 8 6 7
3
2 6 5 3
4 9
7 9 6 8 1
2 6 7
6 1 4
Hard #7
7 9 5
2 5 8
5 3 1 7 9
3 2 7 1 9
9 4 3
1 4
7 6
9 4 5
1 8 6
Hard #8
1 8 7 3
5 9
6 2
3 7 9 2 6
1 7 8
8 5 7 9
5 8 4 6 7
3 1
2 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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