Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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