Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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