Printable Hard Sudoku

Set 2k3isy. 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
1 8 2 9 6
8 9 7
9 3 4
7 1
4 6 7 3
5 4 3 8
3 4
2 1 5
1 5 8
Hard #2
6 1 5 7
7 8 2 9
6 3
5 3 9 6
6 1 9 3 8
7 9 1
1 6
5 6 2
4 9
Hard #3
5 9 3 6
7 1 6 2
6 4 8
6 7 5 4
3 6
6 4 7 3
3 8
7 9
1 9 5 2
Hard #4
1 3 2 8
8 7
7 1 4
5 7 6 2
8 1
2 5 9 1
9 4 7 6
6 1 9
4 6 5
Hard #5
4 5
9 7 4 5
5 4
1 9 6 4
2 5 7
3 7 6
5 2 8 9 6
8 1 7 5
3 8
Hard #6
3 8 9 1
1 7 8
6 3 8
1 6 2
7 3 2 8
6 7 4 5
9 3 7
7 5 3
6 9
Hard #7
3 9
8 6 3 2
3 9 1 4
5
5 3 4 8
6 3 5
4 8 3
9 2 8
3 2 1 5 7
Hard #8
9 2 6
6 4 7
7 5 4 9 3
7 8 6
2 6 3 5 9
1 5 7
3 9 4
5
6 1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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