Printable Hard Sudoku

Set 1sdhv8t. 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
2 8 1 6
2
6 8 4 7 3
4 5 7 8
1 6 4 7
1
3 8 4 6
6 3 9 2
9 5
Hard #2
4
9 7 3
7 1 6 9
8 4 1 6
3 1 7 9
6 3
1 3 6 7 2
4 8 1
5 9 4
Hard #3
8 4 7 1
2 4 1 6
9
3 7 8
1 2 8 5 3
2 9
3 6
6 8 2 7 9 1
9 4
Hard #4
2 8
8 2 5
7 3 6 9 8
6 7 1
3 4 8 2
2 4 3 5
2 7 4 6
4 1
3 9
Hard #5
2 5 9 1
7
1 2 3 8
7 1
5 3 7 2 4
2 4 9 3
1 8 7 4
9 2
4 5 3
Hard #6
2 4 1 7
8
1 5
8 7 2
9 5 7 4
4 3 2 7 8
5 4 8 3
8 3 2 5
6 2
Hard #7
3 1 7 2
8 2 5
1 5 9 8
9 4 5 3
5 4 7
6
2 8 3
4 8 7
5 3 2 9
Hard #8
2 1
7 8 1 3
9
2 8 5
3 7 4
1 8 5 7 2
6 3 9
3 4 2
4 9 2 1 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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