Printable Hard Sudoku

Set 5q7ckc. 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
8 5 7
5 8 1 6 3
4
9 3 2
6 7 5 4
9 6 3 1 2
4 1 7 6
2 5 8
Hard #2
8 6 7 5
3 1 5 4
1 7 3
7 2 1
4 6
2 3 1 4
8
9 6
4 3 6 9 8 2
Hard #3
8 6 2 9
2 4 1 7
8 3
7 2 4 6
1 3 8
2 8 5 6
7
7 9 2 4
7 9 6
Hard #4
7 5 2 3 1
6 7 2
8 9 4
5 9 1
3 1 4
5 7 6
6 3 1 7 9
3 5
4 5
Hard #5
2 6 1
9 4 8 3
6 4
9 3 7
7 9
7 1
6 2 4 9 7 1
5 4
8 2 6 5 7
Hard #6
4
5 2
8 5 3
4 7 8 5 1
1 9 7 6 5
8 3 9 7
5 6 9 3 8
4
3 8 5
Hard #7
1 3 8 5
4 9
5 6 1 8
4 8 9
6 7 2 4 3
3 1 9
6 8 4
2 4 9
9 7
Hard #8
4 5
6 2 8 7
3 8 7 4
9 2 1
7 6 2 5
1 8 9 4
6 9 5
4 1 8
4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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