Printable Hard Sudoku

Set 1w79q1j. 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 5
3 1 9
9 3 2 8 6
8 6 7 2
5 3
7 4 3 9
6 7 3 8
9 5 2
4 5
Hard #2
3 9
5 4 8 2
9 5
1 4 7 2
5 1 9
2 7 1 4
8 7 3 6
4
9 5 7 3 2
Hard #3
3 9 8
5 9 2 1
6 9
8 7 4 2 9 6
4 9 3
1 9
5 4
7 8 4 9
8 4 7
Hard #4
9 4 8
8 9 1 5
5 3 6
6
4 3 8 7 9
2 3 9 4
1 5 7 2
7 2
8 5 6
Hard #5
5 1 3 4 7
2 8 1 6
6 7 9
4 9 2
7 2 5 8
5 4
7 2 6 3
1 8
5 3
Hard #6
8 5 6
8 3 4 1
4 9
7 8
4 8 6 1
6 9 3 2
3 4 1
5 8 2
1 7 3 4
Hard #7
6 2 1 9
3 9 5 6
2 4 3
2 7 5
4 9 8
7 2 6
1 5 3
7 8
3 6 8 1
Hard #8
5 1 6 9 8
3 9 6
5 6
3 9
5 4 1 8 3 6
3
8 7 2
7 5 2 6 4
2 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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