Printable Hard Sudoku

Set 19ok23d. 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 4
9 2 5 8
2 4 7
5 4 6
3 5 9
9 8 4 5
1 5 7 3
9 3
7 6 1 4
Hard #2
5 7 3
9 5 7 6
4 6 9
2 9
8 1 6 7
6 3 2
4 5 3
2 8 9
9 4 1 8
Hard #3
5 7 4 2 8
3 2 1
6 4
3 4 5
8 6 1
7 3
7 1 4
7 9 8 3 2
8 3 7
Hard #4
1 4 8
7 3
2 3 6 8
5 1
8 1 4 6 5
4 5 2
5 8 3
1 3 6
9 6 2 4
Hard #5
9 7 4
2 1 7 6 8
4 2
3 1
5 4 3
3 5 9
7 8 9 2
5 9 3 1
4 8 2
Hard #6
2
8 5 1
1 6 4 8 3 2 9
4 6 3
8 4
8 3 4 6 1
5 4
6 1 8 5
3 9
Hard #7
6 3 8 5
8 5 9 6 2
6 4 9 3 2 8
6
8 2 5 1
7 1 6 4
1 9
3 8 2
Hard #8
7 4
4 7
9 8 1
1 2 5 8
8 4 7 3 2
3 8
4 1 8 6 5
5 9 8
9 7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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