Printable Hard Sudoku

Set 1vhllq9. 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
5 1 7 9 8
9
8 3 2 1 6
5
2 5 7 8
8 3 6 4
4 1 9 5
7 6 9
8 3
Hard #2
2 8 9 1
3 5 7 4 2
4 6
9 4 5 8
3 2
7 2 3
6 1
1 3 9
3 1 6 5
Hard #3
6 5 9
2 1 4 9 7
1 4 3 6 8
8
5 4 1 9
4 3 7
7 4 5
2 1
8 5 2
Hard #4
5 8
6
6 1 8 2 9
3 5 2
2 7 9
9 1 2 6
1 2 8
6 4 2 5
7 4 5 1
Hard #5
9 1 3
8 6 5 4 7 9
7 5
2 3 4
4 3 7
1 9 2
5 1 7 2
6 9
8 9 3
Hard #6
9
2 4 7
7 2 5
3 6 1 9
7 3 5 1
5 8
8 5 3
6 4 8 1
5 4 9 1 6
Hard #7
6 3 8
8 4 3 5
9
5 7 3
2 8 6
2
8 1 5 4
3 6 4 9 7 1
9 3 4 8
Hard #8
8 3 6
6 7 2 8 1
1
3 6 4 9
9 5 7 1 6
7 4
4 2 3
7 5
3 9 2 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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