Printable Hard Sudoku

Set 16o1rcz. 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
1 8 2 5
3
4 2
5 2 9 4 1
5 6 4
6 3 9
6 3
6 9 1 8
8 3 9 5 6
Hard #2
7 4 8
2 3
1 3 8 4 6
4 7 8 5
1 6
2 5 1
6 8 3 7 1
5 4
3 9 4
Hard #3
6 8 5 2
1 2 5 9 6
2 9 3
3 9
7 8 5
7 1
8
4 1 5 8
6 3 1 7 4
Hard #4
5 8 2 4
4 9 7 2
3 1 8 9
8 7 6 1
1 2 5
5 4 2
5 3
6 8
1 7 3
Hard #5
2 5 1 9 3 6
8 6 5
6 7 2
1 3 7
9 4 7 3
7 6 9 4
4 9
6 7
1 8
Hard #6
9 3 2
6
1 8 5 3 7
6 1 8 9
2 7
7 9 6 5
3 6 4
1 2 7 5
8 3 5
Hard #7
4 9 2
1 3 5
6 3 4 8
8 1 9 5 6
7 6
9 5 7
8
2 4 9 8 3
1 9 7
Hard #8
7 8
9 3 4
4 8 6 9
8 5 3
4 6 2
5 7 2 9 3
4 6 3
2 8
8 3 1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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