Printable Hard Sudoku

Set 1sdk9dg. 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
9 4
8 6 2
5 7 6 1 4
4 9 5
5 9 8 2 1
7
7 8 1 3
3 2 7
9 2 5
Hard #2
8 5 2 7 4
9 5 1
7 1 6
1 9 5
1 2 7
3 8
5 4
3 4 9 1 8
8 2 6
Hard #3
6 9 1 3
8 2
4 6
3 4 8 7 9
7 1 2 4
9 5
8 4 2 7 3
1 3 2 8
5
Hard #4
5
4 5 6 8 3 2
8 7 2 1
3 2
5 6 7 4 8
7 9
9 7 2 8 6
2 1
6 4
Hard #5
3 7 1
7 8 5 6
6 5 7 8
3 2 9 6
1 2 8 5
9 3
7 1 9
2 7 8
5 6
Hard #6
7 8 4
9 5 4 3
3 9 7 6 5
2 6 3 9 5 7
8 6
9 7
7 2
6 3
3 4 5
Hard #7
1
4 2
7 1 9 4 6
6 9
8 3 5 2
3 9 4 7 6
2 9 8 3
1 9 5
7 4 1
Hard #8
2 6 4 1 5
1 7 4
6
3 1 4
8 4 6 9
7 3 6
3 5 1 9
2 9 4
4 3 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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