Printable Hard Sudoku

Set 1v86lz3. 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
7 3 6
6 2 4 8
2
1 8 3 7
2 8
4 9 7 2 3
2 5 1
9 5 1 8
4 1 5
Hard #2
4 3 7 2
7 4 8
2 9 1 5
7 8 2
8 9 5 1 3
5 2 4
1 2
4 3 9
3 4
Hard #3
6
5 1 3 7
1 3 8 9 2
7 5
4 9 8
6 7 1 4
3 7 2 5 6
5 7 1
8 9
Hard #4
8 3 2
6 9 7
5 6 9
7 5 2 1 6
5 8
3 6
4 9
6 4 3 8 7
6 8 1 9
Hard #5
2 4 1
4 9 8 5 3
7 9
5 3 8 4 2
7 2 8
3
6 3 1 2 4 5
1
2 3 6
Hard #6
7 2 3
8 5 1 7 2
1
6 2 8
7 4
4 8 5 6 1 3
2 8
1 9 4
4 6 5 2
Hard #7
5 6 7 3
8 2 4
4 8 1 5
5 3 9 6
7 2
2 5 7
1 3 6
9 4 5
9 3 2
Hard #8
8
2 4
4 7 9 8 5
3 2
3 8 2 7 9
2 9 6
5 6 1
7 1 6 8 3 5 4
9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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