Printable Hard Sudoku

Set hiii47. 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
7 8
7 3 4
8 9 2 5
9 3 8 5
5 4 3 9
7 1 4
3 5 2 6
6 8 7 9
4
Hard #2
2 1 4
7 5 6
3 5 8 1
1 4 6
6 4 9 5 7
9 6 5 3
3 2 4
2 8 1
9
Hard #3
9 3 8
3 9 5
2 5 7
3 7 8 1 2
6 4 7 3
5 9
2
7 4 1
8 4 7 3 6
Hard #4
8 7
5 6 9
6 7 3 2
2 7 1 9
7 1 4 9 2 5
5 3 2
9
8 6
5 6 1 8
Hard #5
1 4
5 2 1
6 2 1 9 5
3 8
2 5 7 6
6 3 4 1
1 5 6 3 2 9
2
7 3
Hard #6
5 7
1 3 5 9
2 3 1 8
1 9 7
5 1
9 7 4 3
4 8 1 2
8 4
2 6 3 5
Hard #7
4 7 8 2
8 2 1 6
7 6 3
3
9 8 5
1 7 8
6 8 7
7 2 1
2 1 3 9 6
Hard #8
6 9 3
4 7 3 1
8 3 5 1 2 4
7 9 2
7 4 8 6
3 7
7 3 4 9 6
8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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