Printable Hard Sudoku

Set 87oxot. 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
5 3 7
4 6
4 2 7
5 3 1
8 3 6 4
9 8 5 3
6 2 1 9
4 8 1 9 7 6
Hard #2
3
5 9 4 2 7
6 5
1 5 2 4
8 1 3
6 3 5 7
7 9 4 1 8
5 6
8 9 3
Hard #3
9 1 6 2 5 7
2 6
3
4 2 1
3 7 1 5
7 8
7 8 1
1 8 7 4
4 2 6 3
Hard #4
5 9 6 8
7 3
6 8 9
8 6 7
9 7 8 1
4 5
4 3 7 9
1 3
8 3 5 6 4
Hard #5
4 7 3
8 2 1 9 7
6 4
7 8 3 5
9 4 1
1 3 2
7 6 8
9 4
7 4 1 2
Hard #6
2 1 3 9 8
8 3 1
5 7 4
3 4 2
1 8 2 7 3
3 4
7 9 6 3
2 8
8 9
Hard #7
2 4
1 4
3 5 4
7 3 2 1
9 2
1 6 7 3
8 7 1 9
9 6 7 3 2
4 6 5
Hard #8
8 3 6 9
6 1 9 2 5
2 3 7
7 5 6
8 2 6
9
3 1
5 7 6 8
2 1 5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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