Printable Hard Sudoku

Set 10nkbyg. 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
3 5 9
8 3 6 4
6 2
7 9 1
3 1 9
9 8 6 2 7 4
3 5
1 7 9
3 8 4
Hard #2
6 3
4 5 7 1
1 2 7 9
8
7 2 1 3
1 4 5
3 6 9 1
2 7 8 5
5 8 4
Hard #3
4 3 9
3 4
2 1 6
4 7 3 2 5
5 8 7 6
6 5 9
1
9 4 8 2
4 8 5 3
Hard #4
9 5 3
8 4 6 9
8 1
3 4 6 2
2 4 8
3 1 7
4 2 3
7 3 1 8
5 8 4
Hard #5
8 7 1 4 6
3
3 6 2
8 3 6 1
6 2 1 8
3 4 8 6
9 1 3 5
6 8
7 2
Hard #6
5 3 4
6 2 1
8 7
7 2 5 4
6 8 5
5 9 3 7
6 4 1
5 2
4 7 8 2 9
Hard #7
9 6 1 2
5 3
8 9 6
6 5 2 8
5 2 4
4 8 7
4 9 3
4 3 6 1
6 1 8
Hard #8
1
5 4 9 6 3 7
3 7 4 6
7 5 4
6
2 9 8 4
4 3
6 9 1
9 8 2 7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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