Printable Hard Sudoku

Set er2k9p. 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 4 9 3
5 1
3 1 7
9 8 2 5 6
6 1
8 9
2 4 5 9 1
3 6
3 6 2 4
Hard #2
6 9 5
2 6 1 7 4
4 2 8
6 1 4 8
7 2 6 9
3
5 8 2
5 4 3
9 7 6
Hard #3
5 9
7 1 8
5 8 9 4 2
6 8 7
2 1
8 9 4
3 1 8 6 2
5 3
4 5 7 6
Hard #4
7 8 9 5 3
4 2 9
2 3 5 8
2
4 8 7
9 5 3 7
6 8 7
7 4
3 4 6 1
Hard #5
1 9 4
8 5 2
9 5 3 2 6
7 8 3
5 3 6
8 1 6
2 3 5
5 4 3 9
7 5
Hard #6
3 4 5 2
5
9 7 1 8
9 1
6 4 7
6 8 9 4
1 4 7
6 1 9
8 4 3 7 5
Hard #7
9 7
6 2 8
7 1 8
9 5 4
5 6 1 9
2
1 6 7 3 2
7 1 3 4
4 9 2 6
Hard #8
5 3 1
3 2 5
1 8 6 9 3
1 8 5 2 4
3 7
6 8 7
7 5
1 6
4 5 9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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