Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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