Printable Hard Sudoku

Set 17ink20. 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
2 9 5
9 7 8
7 3 1 2
5 4
4 1 6
8 4 3
1 9 5 2 4
4 5 7
7 8 9
Hard #2
8 3 2 7
3 9 8 4
2 7 3
6 7
4 2
7 5 9 2 1
6 4
4 1 8 6
9 7 5
Hard #3
4 1 6 8 2
3 9
7 6 3 5
6
8 3
2 8 5 1
4
3 7 2 9 4
4 7 8 2 9
Hard #4
5 3 1 6
8 2 9
1 9 4
1 4 2
6 7
1 9 5 7 8
9 4 3 8 7
1 2
6 3
Hard #5
8 3 9 7 5
8 2 9
6 2 8 7
4 6 2
8 1 5 6
9 8 2 4
5 3
1 3 2
4
Hard #6
7 2 9
5 1
8 6 1 5
6 1 4 3
4 5
3 7 8 2 1
2
1 4 5 3
1 7 6 5
Hard #7
5 3
7 3 2
2 1
5 8 4 7 9
4 3 2
4 3 7 6 5
8 9 4 2 1
7 8 6 9
Hard #8
6 7
3 4 2
8 2 1 6
7 1 4
8 3 9 5 6
9 2
2 9 5 4
3 6 1 2
9 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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