Printable Hard Sudoku

Set 15lvkb9. 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
8 2 4
1
9 2 8 1
4 8 5
5 9 7 4 3
3 1 9
6 1 7 5
5
7 1 2 6 4
Hard #2
8 4 6 5 2
6
5 1 4 8
4 9 1
9 3 6 2
3 1
2 1 8
5 2 6
1 9 8 3
Hard #3
3 7
5 9 1
9 3 5 8 4
6 4 1 2
8 4 5 7
9 7 6
7 9
6 2
9 2 5 3
Hard #4
7 9 8
6 2 7 3 5
3 5 6
7 3 5 1 4 9
5 9 8 3
7
6 4
4 3 6 9
1
Hard #5
5 2 7
1 8 6
7 9 3 5
2 7 9
1 6 5
5 4
8 5 7 3 6 1 2
1
9 5 8
Hard #6
3 7 6 2
9 3 1
1 7
4 9 2 5 6
3 1 6 5
2 4
6 5 2 3 1
7 4
2 8
Hard #7
6 5 2 4 1
8
1 2 9 4 5
8 3 4 1 6
6
9 7
8 7
2 6 4
7 5 4 9 1
Hard #8
1
6 4 9
9 6 4 3
5 7 6
2 3 8 5
5 4 7 9
7 1 3 2
8 9 5 7
6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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