Printable Hard Sudoku

Set 16loqx0. 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
3 2
6 8 4
1 2 3
6 5 7 8 9
1 2
9 8 2 4 7
5 4
7 8 5 3
8 6 4
Hard #2
2 7 9
6 7 8
9 3 1 5
1 5 4
5 2 3
6 7 3
8 5
7 8 6 9
3 6 2 7
Hard #3
2 5
2 7 1 4 6
5 8
1 9 2
6 2 4 7 8
7 2
3 4 7 2
7 1 2 5
8 9
Hard #4
1 7 8 2 5
2 4
6 7
6 9 3
4 5
1 9 3 4
6 3 7 4 8
2 1 6
2 9 5
Hard #5
2 7 9
1 7 3 9
3 8 6
4 6 3
2 7 6 9 4
8 3
2 7 1 6 9
5
5 4 2
Hard #6
4 7 6 9
1 2 3
7 9 3 8
2 9
2 7 5 4
6 3 2
4 6 3 2
5 1
9 7 6
Hard #7
5 8 1 9 7
6 2 8 3
7 3
1 5 3 6
9 2 5
2 4 8 1
4 6 2 8 1
5
8
Hard #8
8 9 4
7 2 1 4
1 2
2 6 9
3 4 7 5
4 9 7 2
4 8
6 5 8
2 1 5 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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