Printable Hard Sudoku

Set i1obbn. 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 1 8
9 2 8 3 6
4
8
2 6 1 5 3
1 8
9 4 5 3
1
5 1 3 9 2 8
Hard #2
5 4 8
8 9 5 4 3
3 6 1 5
3 7 4 1 6 9
3 5
6 9 5
8 7
6 7 8 1
Hard #3
4 3 1 8
8 4
7
8 5 2
2 4 8 9 7 6
9 6 3
2
1 9 4 7
5 2 7 6 9
Hard #4
7 6 3
8 5 6
4 2 7 8
4 3 9
7 8 6
3 9 5 1
9 1 8
9
6 9 5 1 3
Hard #5
5 4 9
5 2
1 7 6
3 6 7 5
4 8 1 7 6
4
2 8 4 6 3
6 3 1 7
3 8
Hard #6
6 1
5 3
9 8 7 4
6 9 8
7 2 4
4 5 7 8 9 3
1 6 2
4 7 9
3 1 6
Hard #7
7 6 5 1
8 9 6
5 2 4 9
4 1 7
9 6 3 4 2
8 5 3 2
3 4
4
8 2 5
Hard #8
4 1 5
1 5 6 2
8 2
5 1 9
9 4 5
1 3 7 4
9 2 7 1
6 2 4 3
5 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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