Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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