Printable Hard Sudoku

Set 51ea4k. 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 8 6 5 1
7 1 2 4
1 6
1 9 2 4 8
2
2 6 1
9 1
5 6 9 3
4 8 1
Hard #2
4 6 1 2
3 4
1 6 4 7
5 1 2
3 2 6
2 9 1
3 5
9 5 4 1
7 2 8 3
Hard #3
5 6 3
9 8 5 1
3 7 9
7 1 6
4 2 9 6 8
4
9 6
1 8 7 2
6 7 2 4
Hard #4
3 7 1
5 3 4
9 5 6 3 8
5 1 9 6
9 4
2 1 6
6 4 9
3 2
7 4 5 6
Hard #5
1 3 7
6 7 1
9 3 4 8
8 6 1
8 7 5
2 3 6
8 5 9 7
6 5 8
3 7 6
Hard #6
4 6
8 7 5
3 8 7
8 2
1 9 5 4 6
7 4 5 1
9 3
2 4 1
6 8 9 4 3
Hard #7
7 1 6 2
3 8
4 8 6
4 6 9
1 3
6 2 8 7
5 2 1 9
1 9 2
9 6 4 7
Hard #8
1 5 6
5 8 4
4 3
5 1 4 3 2 9
3 6 8
8 3 7
2 3 1 8
9 8 1
8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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