Printable Hard Sudoku

Set 1osu1or. 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 7 9 8 6 5 1
4 5 3
2 7
9 1
3 9
2
5 8
7 4 9 8 2 1
6 1 3 7
Hard #2
1 7 5
3 2 9 1 4
3 4 8
2 5 8
2 6
8 9 2 3
6 4 2 9 1
9 7
7 4
Hard #3
5 2 6 1
2
6 4 5
7 8 4 3
9 1 2
4 3 1
6 4 9 8
3 8 7 2 9 1
2
Hard #4
6 9 4 3
7 9 1 3 6
7 2 8
4 1 9
6 5 3
1 8 7
2 8 4
1 7 3 6
3
Hard #5
4 6 1 3
7 6 4 9
1 7 9 8
5
9 3 2 7
8 1
9 3 1
5 2 7
5 4 8 3
Hard #6
5 9 1
6 1 2
7 3
8 6 1 4 7
6 9 8 3 2
6
8
9 2 8 6 3
7 5 6 4
Hard #7
1 7 2
8 9
5 1 2 4
8 9 6 3
4 7 9
5 9 3 8
6 7 3 2 8
8 3 2 9
Hard #8
5 3 9 2
8 6
4 5
5 2 4
6 1 7
1 7 4 3 5
2 7 4
7 6 3
3 4 8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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