Printable Hard Sudoku

Set 1cz9ld4. 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
1 6 4 8
3 8
2 4 9 6 7
8 5 2
7 1 3
5 3 6 8
8
8 5 9
3 1 4 8
Hard #2
5 7 4
9 1 3
3 8 1
5 9 3
6 7 5 2 1
8 4 7
6 4 8 1 5
8 1 6
2
Hard #3
7 5 4 8
8 9
4 9 8 1 6
3 6 8 9 2
6 8 4
9 7 2
1 3
4 1
2 3 9
Hard #4
2 6 5
7 4 5 8 9
8 1 7
7 4 8 1 5
6
4 5
2 9 5
6 3 9 8 1
6 4
Hard #5
7 6 9 4
4 3
2 5 9 8 6
7 1 9
3 6 5 7 8
9 4 7
3 7 4 5 1
5 2
Hard #6
8 6 1
3 5 8 1 4
9 2 7 6
4 3 1
4 7 2
8 5
5 1
8 4 9 3
2 4 8
Hard #7
5 3 7
9 6 4 1 5
7 5 3
3 5 9
1 4 5 8
8 1 7
2 8
4 3
8 9 4 2
Hard #8
5
2 4 9
4 1 7
3 6 8 4 5 9
5 9
9 7 5 8
4
1 3 6 4
6 9 5 1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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