Printable Hard Sudoku

Set s78q7q. 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
4 7 2
9 7 5
3 6 4 8
5 9
2 7 4 1
3 8 7
1 5 2 9
9 2 3 6 1
8
Hard #2
9 2 1
7 2 8 3 5
8 6
1 4 8
3 5 6
2 8 5 7
4 2
4 3
5 7 8 1 3
Hard #3
3 5 2 6
9 6 2
4 6 9 3
8 9 1
4 9 5
2 3 4 8
6 7 5 1
7 9 3 4
Hard #4
5 7
1 2 6 8
6 7 8 3
8 4 7 3 2
5 7
9 2 5
5 6 1 4
9 4
7 2 4
Hard #5
6 4 3 8 1
3
9 2 7
3 1 5
7 6 4 5 3
5 9 4 8
7
4 2 6 1
5 2 4
Hard #6
7 2 8
5 7 8 6
4 9 3 5
7 5
6 1
2 8 6 4 7
9 5 7 1
1 2 8 9
6
Hard #7
6 8 7 1
4 5
5 9 2
7 9
9 6 1 8 2
2 4 3
7 6 1
8 3 5
2 1 4 8
Hard #8
3 6
9 1 5 3
5 9 4
4 3
8 3 6
4 8 2 7
9 7 2
7 6 5 3
6 1 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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