Printable Hard Sudoku

Set 19ou3et. 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 8
5 8 3 9
4 1 8 3
8 2 5 7
4 6 2
7 9 2
6 8 3
4 3 7 1
9 6
Hard #2
8 7 3 4
6 8
5 7 8 9
2 5
5 6 9 4
6 4 2 3
2 7
5 6 1 4 3
9 8
Hard #3
4 1 2
1 7 5 2 8 6
3 9 5
8 1 5 6
2
3 6 1 7
3 8 1
9 3
2 8 7
Hard #4
4 8 3 2 1
8 2 7
3 5 4
9 8 4
7 6 3
4 2 5 8
6 2
6 9 8 7
7 4
Hard #5
7 5
4 1 3
1 2
6 2 7 5
7 6 2
5 1 4 8
3 9 1
9 8 3 1 6
5 7 8
Hard #6
3 1 8
7 3 2 4
6 3
6 7
2 9 3 8 4
8 7 4
5 6 2 7
1 2 4
3 5 9
Hard #7
5 8 7 2
3 4 1 9
9 7
6 3 4
1 4 9
3 5 1 8 2
1 8 3
8 6
5 9 7
Hard #8
2 3 7 4 6
1 2 3 7
9 6
4 3
6 8 1 2 4
3 9
7 1
5 6 3
7 1 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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