Printable Hard Sudoku

Set 1fu0dvn. 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 8 7 6 4
9 8 1 6
8 7
5 3 1
3 4 1 7 6
4 6
9 4 3 2
8 1 9 5
Hard #2
5 9 4 2
4 8 7
1 2 7
9 5 3
3 2
1 8 5 7 2
7 3 5 9
2 8
3 6 8
Hard #3
8 7 2
3 2 9
1 7 5 4 3
1 7 3
3 6 7 2 4
9 5
2
4 8 3 1 6
1 8
Hard #4
5 8 1 4
8 7 9
1 8
4 3 6
7 2 3 5 9
7
6 8
8 7 9 6 2
2 5 8 6
Hard #5
2 5 3
8 7 5
2 7 9
9 1 4 3
4 6 7
8 6 5 1 9
5 2
2 3 9
6 1 2
Hard #6
4 3 7
3 5
3 1 8 5 2
6 2 3
7 9 4
2 1 6
5 4 7
4 9 1 8
2 5 7
Hard #7
1 6 3 2
6 3 7 5 8
4 6
7
8 3
6 9 2 7 1
5 8 4 6 2
3
2 3 7 8
Hard #8
5 7 3
9 8 5
7 2 5 1
5 2 8 1 4 9
8
6 4 1 3
5 1 3 4
7 2 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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