Printable Hard Sudoku

Set o2g625. 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 2
3 1 4
4 9 2 8
1 5
2 5 9 7
1 4 6
9 8
8 3 7 6
2 7 3 6 1
Hard #2
6 9
4 1 2
6 4 5 2
1 8 9
2 6 4 8
9 5 8 7
8 2 5 1
3 1 8
7 9
Hard #3
3
5 7 4
2 8 7
4 1 8
8 1 9 7 3
6 8 5 2
7 2 9
9 3 2 8
3 9 5
Hard #4
2 8 3 5
9 3 8
5 1 2 7
1 5
8 9 7 1 2
6
3 2 5 9
6
1 4 8 7 2
Hard #5
2 7 4
3 4 1 2 9
7 8 3
8 6 5
6 3 1
9 5 3
6 9 3 4
2 7 1 6 8
Hard #6
5 7 4
3 5 2
6 8 2 1
3 7 4 9 5
8
6 1 3 5 7
5 7 4
8 3
9 6 8
Hard #7
4 3 8
9 7 5 6 3
6 9 7 4 1
5 2
2 4 6 3 1
5 9 4
2 7
3 1 7 9
Hard #8
8 1 6
5 8 4 1
3 1 9 4
3 9 4 7
5 1 6 9
1 6
4 5 2
2 1
3 7 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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