Printable Hard Sudoku

Set 13yiam6. 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
6
9 8 1 5 2 7
2 8 1 6
1
8 7 6 5 1 3
8 9
9 2 8
6 4
7 4 2 6
Hard #2
7 3 6
3 2 1 7
4 1 5 6
8 2
6 3 5 9
2 8 3
9 5 4
7
4 5 9 2 8
Hard #3
1 8 5
4 2 3
1 2 8
5 4 6
4 9 5 7 2
6 4
8 7 6 1 9 4
9 2 5
3
Hard #4
7 1 6 3
9
4 9 1 8 5 6
6 8 4 7
5 1 8
7 3
3 9
4 7 2 9
4 3 5
Hard #5
9 1
1 2 4 3
6 3 4 9
4 6 3
8 5 4
3 9
7 1
5 8 4 9
7 1 2 9 5
Hard #6
1 7 2
2 6
8 7 2 1
8 5 4 7
9 5 1
7 2 3 8 5
9 8
3 6 9
6 1 2
Hard #7
6 7 8
4 2 5 3
1 6 2
2 7 9 6
5
9 6
1 2 5 3 7
7 9 8 4 2
4 1
Hard #8
3 9
4 5
3 7 1
1 2 7 5
7 5 4
5 8 2 4
2 7 9 6 8
8 6 1
5 4 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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