Printable Hard Sudoku

Set 18ye3qp. 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
4 8 3 1
7 8
3 4 2
9 4 8 1 6 3
9 1
8 5 2
3 6
9 1 6
1 4 7 2
Hard #2
8 5 7 2
1 3 4 9
7 4 2 8 6
8 7
6 1 9
8 3
4 3 1
1 6 5
5 4 8
Hard #3
8 3
4 1 2
6 8 5 4 9
2 3 5 4
8
7 2 8 1
7 6 9 1
7 9
9 5 2 7
Hard #4
4 5 8 3
7 9
6 1 8
5 3 4 7
4 3 9 5
7 6 2 4
2 1 6
6 9 1 7
5
Hard #5
7 8
5 2 4 6 1
1 8 9
9 5 2 4
4 6 5
2 4 3
5 8 7 6
9 8 1 3 4
Hard #6
6 3
9 1 3
8 2 7
4 7 3 5
8 7 4 9
4 1 3
2 1 6 8
9 2
5 6 9 1
Hard #7
7 3 4 9
5 9 1 2
2 3 1
1 9 5
2 5
4 7 6 9
7 6 1 2
7
8 3 5 4
Hard #8
2 6
8 9 4 6
7 2 5
7 4 3 8 1
5 4 9 6
3 8 1
2 4 6 7 9
8 1 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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