Printable Hard Sudoku

Set 1k3noa0. 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 7
5 7 9 6
9 5 4 3 1
9 4 5
5
7 2 4 3
7 8 1 3 4 6
1 4
8 1
Hard #2
5 7
1 9 3 6 8
9 3
9
7 8 4
6 7 1
7 9 3 8
4 3 6 9 5
2 1 8 3
Hard #3
3
7 8 1
8 2 3 5
1 9 5 2
5 6 7 4 1
5
9 5
7 4 8 1 6
5 6 7 4
Hard #4
5 1 4
8 5 4 9
4 7 9 8 5
3
2 9
1 2 6
3 2 6 4
6 1 9
8 7 5 6
Hard #5
4 8
8 5 4 6 3
3 1 5
5 4
9 7 8
9 1 2
8 6 9
1 4 5
3 2 7 1 4
Hard #6
8 3 9 5
1 9 2 8
5 3 1
4 7 8
9 4 3 8 5 2 7
2 6 4
4 7 1 9
8
Hard #7
1 2
5 9 3
4 6 3 5
7 8 9 4
8 3
2 3 7 5
1 7 8 4 3
1 4
5 7 6
Hard #8
3 4 5 9 6
6 5
7 6
2 5 3 7 8
7 3 2 4
1 6 4
9 3 1
2 7
7 6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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