Printable Hard Sudoku

Set h2h4og. 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 1 7 4
7
9 5 4 6 2
9 8 4
4 5 9 6
8 2 7
7 5
1 6 8 9
9 3 6
Hard #2
7 8 9 2 6
9 7
2
4 3 7 5 1
3 2 9 7
1 8 4
9 6 7
2 8
8 1 4 7
Hard #3
1 2
8 5 3
4 9 7
7 5 6 3
1 9 7 8
6 3 8
6 1 4
2 8 5 6 9
6 9
Hard #4
4 8
7 9 5
4 5 9 2 6
7 1 8
1 4 5 3 6
8 2 4 9
7 6 5
8 2
3 9
Hard #5
3 6 1
7 4 5 8 2
2 9
5 4 9 8
3 1 4 9
2
9 3 2 6 4
5 7 9
7 5
Hard #6
6 8
2 3
3 5 2
8 3 9 7 4
9 7 6
7 1 5
7 3 4 8
2 7 6
1 8 5 7
Hard #7
6 4 7 2
1 8 6
9 5 4
5 4 3 1
7 1 2 8
7 9
6 8 4 3
2 1 7
5 9
Hard #8
8 2 9
2 3
5 1 6 2 8
1
5 7 6
6 1 5 4 7
9 3
7 8 2 3 5
3 1 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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