Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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