Printable Hard Sudoku

Set 1aiv5lu. 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
3 9 7 8
3 4 7
4 8 5 1
9 6
3 2 1 5
9 4 2
8 1 2
6 5 3
7 4 3
Hard #2
4 3 8
9 5 3 1 7
2 6 5
1 4
9 6 5
5 2 6
8 4 9
9 3
8 6 4 2 5
Hard #3
9 5
2 9 3
4 8 3 1
7 8 5
2 5 3 4
6 3 2
3 7 8
7 5 8
3 4 9 1
Hard #4
6 7 8 9
6 7
6 2
2 5
9 8 5
5 6 4
1 4 2 5 3
5 4 8 1 2
9 1 6
Hard #5
4 1 5
8 3
6 9 2
1 7 3
3 9 8 1
8 2 6 9
8 5 6
6 3 5 7 4
7 6
Hard #6
7 3 4 1
9 8
4 8 5
2 4 1 7
7 2 6
5 6 9 2 4
1 6 9
8 4
6 8 7
Hard #7
5 1 6
7 1 9
7 3 9
8 5 9 1
1 3 2
6 7
1 4
8 6 9 5 2
9 2 6 3
Hard #8
3 1 4 2
8 5 9
7 6
4 5 1 9
8 9 7 3
6 1 5
3 4 7
1 7 8 2
9 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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