Printable Hard Sudoku

Set ll48pw. 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 1
2 9 1 5
5 2 7 3
4 3
5 8
1 5 2 8 7 9
3 8 5 4
2 5
1 6 8
Hard #2
9 2 6 3
9 8
8 5 7 9
1 9 6 2 4
8 6
4
4 1 9 2
9 6 4 1
2 5 7
Hard #3
8 1
8 9 6 5 2
2 9 3
5 1 9
4 6 7 5 1 9
1 4
7 1
1 3 8
9 4 2
Hard #4
3 2 6 1 5
9
7 1 3 6
4 3 1
5 7 8
2 8 9
5 1 8 4 3 9
3
3 4 8
Hard #5
7 3 4 5
5 3 7
7 2 1
3 6 5
7 4
6 8 7 9
8 9 2 7
1 5 8 6
8 5
Hard #6
2 5 1 3
3 6 5
5 4 6 9
8 6 5
2 4 8
1 7 4 5 9
8 9 7 3 1
4 3
Hard #7
3 4 8 2
6 2 7
1 6 4
7 4 5
9 6 5 1
5 8 9
2 7
5 3 1 6
6 1 3
Hard #8
4 5 9
9 2 1 7
2 7
2 9 1 6
4 1 7 3 9
9 6 5
3 1 4
7 3 5
4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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