Printable Hard Sudoku

Set iv4a6k. 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 6 8 5
9 3 2
9 2 6 1
3 9 4 6
6 7 1
5 2 8
1 4
6 3 9
8 9 1
Hard #2
8 4 3
2 9
6 3 7 1
9 2 3
7 5
8 1 4 6
9 4
1 7 2
8 2 6 1 5 7
Hard #3
6 7 8 5
3 1 7
4 7 9
5
5 6
9 1 4
8 1 6 9
9 4 7 3
7 9 4 1 8
Hard #4
4 8
6 7 2 5
3 1 7
3 2 8
5 7
7 2 6
1 7 3 8 4
5 1
5 3 8 9 6
Hard #5
6 4 2
4 5 1
9 3
6 9
9 4 6
1 6 4 7 3 2 9
7 3 5 9
2 8
5 1 4
Hard #6
6 5 9 1 3
3 7
1 2 5 6
9 4 1
1 5 2 3
6
5 6 7 9
8 7 2
9 5 6
Hard #7
5 2 3
3 9 5 6
2
4 6 5 8
9 8 4 7 5
5 6 3 9
6 1
5 3 7 6
4 5
Hard #8
1 2
4 8 9
6 4 8 3
5 8 9 6
3 9 6 1 2
9
7
8 2 1 3 7
6 7 5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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