Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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