Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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