Printable Hard Sudoku

Set 17s6d1c. 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 2 5 6
6 4 1
7 4 9 2
9 1
7 9 3
6 1 8
2 5 3
6 3 7 5
7 6 2
Hard #2
2 6 9 5 4
7 5 6
6 2 9
9 1 8 4
4 9 2
5 7
3 2 1
4 6 7 8
8 2
Hard #3
9 7
8 6 7
2 4 5 1 3
7 8 1
6 5 1
4 7 6
5 6
5 8 9
1 6 9 5 2
Hard #4
1 5 7
1 5 7 8
6 3 9
8
1 9 3 4 2
4 8 3
5 2 7 1
2 5
3 4 1 6
Hard #5
9 5 4 6 8
2 1 7 5
7 5 1 2
4 8 6 9
3 7 5 4 2
1
9 8 3
9
4 8
Hard #6
9 6 1
6 1 4
7 4 3
8 5 9
6 5 8
2 8 9 6
4 3 2 5
1 8 4
8 3 6
Hard #7
7 1 8 9
6 1 9 8 7 5
4 5 3
9 5 8
8 7 5
7 2 4 9 3
9
2
8 3 1
Hard #8
4 2 9
4 8 5 9
9 7
7 6
7 8 1
2 3 1 4
2 9 4 6 5 3
7
3 2 4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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