Printable Hard Sudoku

Set 1n3twoj. 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
2 7 8
7 5 3 2 9 6
3 9 2
9 6 4 7
2 6 5
1 9 3
7 1 3 4
5 8 9
Hard #2
3 8
4 8 6 3
9 1 7
9 1 4
7 4 8 1 6
6 5
5 4 2 1 3
1 3 5
1 4
Hard #3
5 7 9
4 5 9 6
1 4 5 3
3 1 7
6 3 4
4 5 9
6 8 4
5
2 9 4 1 7
Hard #4
6 7 5 8
2 1 3
2 7 9
3 1 5
2 7 8
5 6 7 4 3
9 8 5
4 9
8 2 6
Hard #5
6 9 8 5
4 9 1 3 6
5 1 2
4 8 6
7 4
6 4 3 5 2
7 9 3 2
5 9 1
Hard #6
3 4 7
9 8 6
7 3 2 8
2 5
9 4 1 2
1
1 9 8 5 7
7 3 5 6
6 4 7
Hard #7
9 6 3 8
8 6 2 7
2 1
3 9 7
8 2 4
7 6 8 5
2 3 1
7 9 8
4 1 9
Hard #8
8 4 9
8 2 5 7
3 9 1
8 7 3
5 1 3 6 2
8 1 4
2 6 9 1 3
6 4
5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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