Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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