Printable Hard Sudoku

Set 1q4y9x2. 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
6 7
8 2 5 4
1 6 4 8 2
2 4
7 4
9 5 6 8
2
6 7 8 9
4 2 5 8 6
Hard #2
6
6 1 9
7 5 8 2
4 6 5
4 9 2 6 3
8 3 7 2 9
6 4 3
7 8 4
3 9
Hard #3
1 2 9
8 5 9
2 7 4 1
6 5 1 7
2 6
4 6 7
5 7 6
6 1 2 3
2 3 1
Hard #4
6 8 5
2 9 5 6
5 4 1
5 9 4 6 3
2 7 8
1 9 3 6
5 3
4 6 1 5
8
Hard #5
6 1 7
1 2 3
5 4 2
5 4 8 1
6 1 7
8 1 7 9
2 9 5 3
3 6
5 6 1
Hard #6
5 7 6
1 8 4
9 4 5
9 3 7
2 1 4
5 4 2 9
7
9 4 3 6
3 6 7 2 1
Hard #7
9 7 3
9 8 7 5
3 1 8
1 8 5
8 4
3 4 6 7
4 2
4 5 3 9
3 2 7 4
Hard #8
8 4 5 7 9
9 3 6
7 6 4
8 1 4
3 9 7 2
9 2 7 6
5 6 4 2 1
7
8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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