Printable Hard Sudoku

Set 1k6dsv2. 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
7 6 9 4
6 8
5 9 7 8
4 8 5
3 1
8 2 5 4 9
8 4 9
9 2 7 8
1 7
Hard #2
1
1 5 6
2 6 8 4
3 1 8 6 9
7 3
7 1 9 8 6
1 2 9 8
3 9 4
9 8
Hard #3
7 9
9 5 3 4
4 2 3 7
2 1 7 5
1 3
5 6 2
6 2 5 3 8
7 9
5 1 4
Hard #4
2 8 9
3 2
4 7 9 3
9 3 4 1
6 1 4 3
3 1 8 6
6 5 9
1 4 7
8 3
Hard #5
9 6 7 2 3
1 6
4 5 8 6
6 9
3 7 9
3 1 2
9 1 4 5
8 7 3
7 6 9
Hard #6
8 2 3 6
8 1
6 2 9 5
4 7 1
5 9 2 3
7 3 9 8
1 5 8 2 7
8
9 5
Hard #7
8 4
2 4
7 8 6
8 4 5 1
3 9 4 6
9 2 6 3 8
1
7 1 3 2
3 9 8 4
Hard #8
9 1 6
2 3 8
4 5 7
1 4 2
3 2 1 4 8
8 7 3 1
4 2
5 7 6 1
5 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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