Printable Hard Sudoku

Set 1dtth4a. 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
4 3 2
9 1
1 8 7
6 8 5
3 1 7 5
9 6 4 3 2
3 4
6 9 7 3 5
5 8
Hard #2
6
2 1 9 4 8 3
2 4 9
3 5 7
3 7 6 1
1 9
9 3 1
1 6 8
8 7 9 5
Hard #3
4 6 5 3
8 1
9 5 4 3 8 1
1 8 7 2
4 2 8
9
1 3 9
3 1 7 9
5 2
Hard #4
2 1
3 5 7
8 1 5
6 9 3 8
2 6 1
3 2 1 8 4 6
6 3 1 2
8 7
7 9
Hard #5
2 1
4 1 3 7 5
7 4 2 1
2 6 9
9 4 5 8 3
8 7 2 5
7 1
3 2
5 8
Hard #6
8 5
2 6 7
7 3 4 5 1
3 2 5
9
6 7 9 4 5
1 6
4 5 8 7
1 7 5 9
Hard #7
9 8 7 4 3
5 7
8 6 1
9 5 2
9 3
2 6 4 9
6
5 1 3 9
6 3 4 1 8
Hard #8
7 8 5 4
9
8 4 2 3
4 5
1 9 7 6
9 6 2 3
5 8 7 3
3 2 1 6
4 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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