Printable Hard Sudoku

Set 729r3q. 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
1 6
5 8
7 5
5 2 8 3 4 7
4 2 9
8 2 9
1 7 6 9 4
1 2 8
4 3 2
Hard #2
7 9 1
4 2
9 8 3
4 7 8 5
5 7 4
8 2 7 6
5 1 9
6 2 8 5
9 6 2
Hard #3
3 4 1
8 7 9 2
2 6 4
7 9
9 8 5
5 2 1
6 9
4 2 5 7 1
6 9 8 4
Hard #4
4 6 2
9 6 2
3 7 1
7 3 8
6 7 1
3 5 1
1 9 8
6 5 7 3 9
7 4 5
Hard #5
3 9
5 7 2
9 7 4
6 7 1 3 5 9
8 5 2 7
8 6
3 9 8
8 7 3
7 3 1
Hard #6
9 4 8
5 6 2 9
4 8 5
6 3
7
6 2 4 5 7
8 1 5
3 2 4 1
6 4 7 3
Hard #7
8 7 4
3 8
5 2 8 6 3
3 6 2 4
9 4 5 3
2 8
5 6
2 6 1
4 9 7 2
Hard #8
9 5 6
8 4 9 6 3
7 6 4
6 4 8
2
2 6 5
6 4 9 8
1 2 8 5
6 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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