Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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