Printable Hard Sudoku

Set dyx0yp. 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
7 3 8
6 3 5
8 9 2 4
9 2
3 2 7 4 9
6 5 3 1
7 1
8 1 4
3 5 6
Hard #2
4 7 9
9 2
8 9 5 3 4
4 7 6
3 5 1
1 6
5 7 9 8
2 7 8 5
9 7 2
Hard #3
3 1
8 4 2
2 3 4 9
6 8 1 2 5
2 1
3 5 8
2 6 5
1 3 5 7 2
9 8
Hard #4
5 1 4 8
4 6 7 9 5
2 1
2 4 3
9 8 5 3
1 6 4
8 5
3 9 1 5
6 4
Hard #5
2 1 6 7
7 3 4
2 9
9 6 3
6 8 5
9 4 2
9 5 6
8 2 5 1
1 2 8 4
Hard #6
4 2
3 2 8
1 4 8 7 3
5
6 4 2 3 8
7 6 1 3 2
3
7 4 6
6 7 4 1
Hard #7
2 8 5 3
5 6 2 7
4 9 6
8 1 3
1
9 7 2 5
6 9 4 7
1 8 2
7 8 1
Hard #8
9 8 2 1 3
3 1 8
1 9 8 6
1
8 4 3 5
2 1 6 7
4 7 8 2 3 9
4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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