Printable Hard Sudoku

Set 1iagrv6. 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
7 5 9
7 1 6
8 9
3 1 5
4 7 8 5 9
9 4 3
6 8
2 1 4
6 1 3 5 7
Hard #2
6 4 9 1
8 4 2 3
1 7 8
5
2 4 1 5
6 8 7 4
2 4 1 3
8 1 3 7
2
Hard #3
2 4
7 5 4 1 6
4 3 7
6
9 6 2
1 6 3 8 4 9
9 1
3 2 7 8
8 2 5
Hard #4
2 1
8 6 7 2
4 2 1
5 6 3 8
7 9
3 6 7 5
8 3 5 2
1 4
3 8 9 6
Hard #5
3 6 4 7
5
1 7 9 3
5 7 8
9 7 2 3 5
6 3
6 4 7
1 3 9
2 8 6 1
Hard #6
1 8 3 4 6
4 9
6 8 1
4 5 9 8 6
2 7 8
1 3
5 6 8 2 3
1
9 5 4
Hard #7
4 5
8 7 6
8 9 7 2 3
5 2 8
3 1
7 9 6 4
2 9
3 2 4 6
4 2 9 7
Hard #8
5 2 6 1 9
1 4 3 2
6 3 8
7 5 3 6
4
8 3 5 1
8 1
7 5 1
7 8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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