Printable Hard Sudoku

Set 1y68us4. 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
6 5 1
2 4 3
3 1 9
2 6
2 1 5
5 6 8 7 3 4
4 8 3
9 2
8 9 4 7
Hard #2
6 1
8 4 2
8 7 4 5 1
8
9 1 6 7
8 3 2 4
1 9 6
5 7 1 4
9 1 5
Hard #3
3 9 2
1 5 7 6
8 2 5
6
7 4 5 1
4 8
9 7 3 4 8
8 3 2 6
4 5 2
Hard #4
2 6 8 4
9 7 2 1
6 4 5
7
5 8 6
3 1
8 7 5 2 4 3
3 5 7
3 1 2
Hard #5
7
2 1 5 3
3 2 8 9
3 9
9 8 1 3 7
4
5 3 9 7 1 6
7 4 1 3
3 4
Hard #6
9 8 1 7
3 4 5
4 1 6 9
8 2 6
4 5 2 8
1 3 8 9 5 6
4 5 6 3 9
Hard #7
1 8 4
5 8 2
4 8 6
5 2 3 9
9 4 3 6
6 4 8
4 9 5 3
3 2
9 5 1
Hard #8
2 3 8 9 7
6 4
4 1 3 8
9 6 5 1
7 1 4 8
5 4 1 9 6 3
4 2
2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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