Printable Hard Sudoku

Set ljbk4v. 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
1 3
4 8
5 1 7 2 9
6 7 5
5 1
9 3 7 6
6 1 3 8
4
2 9 8 3 4 7
Hard #2
9 6 3
2 3 4 5 6 8
5 6 2
8 9 5
7 6
3 4 2
6 5
8 3
6 5 7 8 3
Hard #3
6 2
9 2
6 9 1 8
7 5 8
3 6 8 7 1
4 7
6 4
8 5 7 1
1 4 9 3 2
Hard #4
4 3
7 4 2 9
1 6 5 4
7 3 1 2
5 9 4
8 3 5
5 6
5 7 9 3
9 5 7
Hard #5
3 2 8
7 2 1 8 5
1 7
3 4
5 6 1 3
9 2 1
7 4
9 3 7 2
2 5 8 1
Hard #6
9 6 4
4 2 5
6 9
1 3 4 5 2
1 7 6
6 5 1
1 9
9 2 7 3
5 8 4 7
Hard #7
4 1 8 9
9
6 4 9 5 2
8 1 2
9 2 7 1 8
5 3 4 7
3 8 9 7
3
5 9
Hard #8
8 1
1 2 7
4 8 9 7 3 6
7 6 3 9
9 2 4
7 4 9
4
2 3 6
5 9 3 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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