Printable Hard Sudoku

Set 19e7ygs. 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
3 2 4 5
4 6 2 9 3
2 5 8
5 7
1 5
8 7 5 9
3 6
7 2 3 4
1 5 8
Hard #2
9 2 4
3 2 9 6
4 6 9
5 8 4 1 7
8 7 6 9
2 7 9
1 8 5
6
4 1 5
Hard #3
8 4 3 7
4 3 7 1
2 5 9
2 6
1
7 2 5
7 8 4
9 3 5 6 8
1 3 7 9
Hard #4
1 5 3 6 7
3
4 1 6 2 5
8
3 5 7 6
1 9 4 8
9 4 5 1
7
2 1 8 5
Hard #5
4 7 8 2
6 5
5 6 1
1 6
9 3 8 4
6 8 4 2 9
2 7
7 9 6
2 5 8 4
Hard #6
9 1 8 5 7
6 5 4
7 6 2
4 5 8
1 9 2
4 9
8 1 7
3 8 9 6 1
3 2
Hard #7
2 1 4
3 7
6 2 7 9 3
7 1 3
9 8 3
6 2 9 4
1 9 8 5
4 1
7 9 1
Hard #8
2 7 8
3 7
9 4
4 6 9 1 7
1 5
3 5 8
6 7 2 4
2 7 3
9 4 1 5 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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