Printable Hard Sudoku

Set 1nw0h94. 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 3 4 8 2
4 6 2 1
5 6 4 7
3 4
2 6 8 5
7
4 5 8 2
1 6
9 7 4
Hard #2
2 3 6 5 1
7 6
3 9 1 5
4 5
5 6 1 8
6 3 9 1
5 8
7 9 8
5 7 9
Hard #3
6 9
2 8
3 5 6
2 4 1 5
8 3
5 9 2 7
4 5 2 6
6 1 3 5 7 4
7 9
Hard #4
1 7 8 9
5 2 7 6 8
3 9
3 8 4
4 2 6
6 4 5
6 3 1 7
1 7 2 4
6
Hard #5
7 3 6
8 2 4 1
3 1 8 4
5 2
4 6 3 1 8
8 7
7 8 3
9 3 7
1 9 4
Hard #6
8 4 6 1
1 7 2 8
5 2
5 9
1 8 5 2
4 9 6 5
8 7 3 4
4 9 6
6 3
Hard #7
9 1
2 5
3 8 4 2 6
5 3 2 7 6 8
7 4 1 2
6 3 4
7 1 8
8 5 9 2
Hard #8
4 2 7 1
8 4 3 5
8 3 2 4
6
8 2 9
1 3 6 9
4 7
2 6 9 7 5
8 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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