Printable Hard Sudoku

Set fut2th. 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 6 9 2
9 1 8
7 5
7 8 1
2 5 8 4
9 2
5 9 7 4 2
1 3 5
2 8 3
Hard #2
9 6 8
2 5 1 9
8 4 5
3 6 5 7 8
6 8 2
7 3
4 3 9
6 7 2 5 9
4
Hard #3
8 7 9
2 9 8
7 5 3
2 3 4
6 3 9
5 4 1 6
2 4
4 7
4 5 9 1 8 6
Hard #4
1 9 2
7 3
4 7 8 3 1
5 7 6
6 9
2 6 7 3
9 7 2 4
2 6 7
8 3 2
Hard #5
5 9 6 2
6 3
3 1 5 8 7
9 5 2 8
7 8 3
5 3 6 4
4
1 4 5 7
7 6
Hard #6
5 2
7 9 3
8 1 4 7
4 7 2
9 8 2 5 7 4
5 2 8 3
7 1 3 5
3 6 9
Hard #7
7 5 6 3
4 9 5 1
3 4
1 7 6
6 3 5
2 8
5 9 3 2 7
8
2 1 5 3 8
Hard #8
6 4 2 3
8 5
7 9 5
7 1
4 1 8 6 2
8 3
1 5 8 3 7 6
8 6 4 9 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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