Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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