Printable Hard Sudoku

Set 1wols39. 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 6 4
6 9
7 5 2 3
3
8 3 7 1 5
6 5 2
4 7
9 3 2 8
3 7 6 1 8
Hard #2
9 2
7 9
4 6 9
7 2 4 5
1 9
4 3 5 9 1 2
7 4
6 5 1 2
1 3 6 7
Hard #3
7
3 2 5
7 5 6 9
4 1 7
8 4 3 6
9 5 3 4
6 4
8 6 9
3 1 6 9 7
Hard #4
6 2 3 7
5 3 1 7 9
1
8 4
2 5 1 7
7 2 9 3 1
4 2 1
2 5 6
8 9
Hard #5
7 2 5
3 4 9
6 3 8 7 2
5 2
1 2 8 7 3
5 9 8
7 1
1 6
3 4 5 7
Hard #6
4 6 2
3 9 6
5 3 7 9
3 9 8 6
7 2
1 8 7
3 8 2
2 9 7 1 5
1 4
Hard #7
1 5 8
2 8 7 6
7 8 2 3
2 6 1
4
1 2 7 5 6
5 9 7
4 3 5
9 6 3
Hard #8
7 9
4 3 2
5 2 9 8
7 6 4 2
8 5 9 6
6 4 9 1
1 8
5 7 8
6 1 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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