Printable Hard Sudoku

Set 1nars0c. 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
2
8 9 1 5
9 8 4
6 8 4
3 4 1 8 9
2 3
9 7 2 4 6
2 8
4 5 6 9
Hard #2
9 2 4 3 6
6 3
2 7 1 8
3 8 5 7 9 1
6 5
9 2
4 5 2
9 3
6 7 4
Hard #3
6 1 5 7
8 2
9 3 4
6 8
9 3 8
2 4 6 1
6 4 5
1 3 2 7 6 9
5 9
Hard #4
6 1
6 7 2
1 8 4
2 5 9 3
7 6 3 4
9 3 7 8
4 7 8 1 5
8 5
3 9
Hard #5
8 6 5
3 4 5 2
7 3
1 7 3 6
9 8 5
5 4 3
6 1 3
4
5 8 7 9 3 6
Hard #6
7 4 3
1 7 5
1 4 6
6 9 1
5 1 7 2
9 2
2 3
3 7 6 5 8 2
8 6 9
Hard #7
6
5 4 6 8
8 2
2 8 3
1 6 3 2 5
9 7 8 1 6
3 1 5 7
5 4 3
9 1
Hard #8
6 9
7 3 9 2 6
9 4 8
4 2 9
7 5
6 1 9 2
9 2 1 6
7
7 5 6 8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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