Printable Hard Sudoku

Set l68rkb. 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 7 3
7 3 5 9
1 8 6
9 7
1 5 3 8
8 9 2 1 6
6 5
2 5 3 6 9
4
Hard #2
6
5 4 1
4 2 9 8
2 8 1 7 5
6 7 3
7 4
5 3 4 8
5 9 2
1 2 5 3
Hard #3
9 2 4 3
5 7 3 6 1
2
5 6 1
2 8 5
9 6
3 4 2 8 9 5
8 1
6 9 4
Hard #4
3 7 9 1
6 7 3 2
2 5 4
4 1 9
8 2 5 4 7 3
8
6 2 4 5
2 5
9 8
Hard #5
8 4 5 3 7
3 8 9
7 6 8
9 6 2 3
1 7 6
3 4 1
4 5 2
2 1
4 6 1
Hard #6
1
4 8
1 6 8 9 7 2
7 5
5 2 1
6 8 4 3
9 2 7
7 1 4 3 5
3 6 9
Hard #7
8 9 1
5 1 6 9
6 9 8 5
5 1
6 2 7 4
4 8 9
2 3 1
9 5
2 4 8 3
Hard #8
1 2 5 4 6
9 4 3
3 7 2
4 3
1 5
1 4 9
5 8 9 6
8 6 4 7 5
4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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