Printable Hard Sudoku

Set 1llkfs3. 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 7 3
9 4
5 2 1 3 4
7 6 3
6 2 5 7
1
8 9
7 4 1 6 2 8
6 2 5
Hard #2
9 1 8 7 6 3
7 2
5 8
3 9 1
4 1
2 7 9 6
6 2 3 8
8 4 3 1
4 7
Hard #3
1 8 4 5
8
5 6 4 7 1
2 9 8
5 7 9 6
1 6
4 3 5 9 6
9 3 4
8 2
Hard #4
3 2
4 8 1 3
2
6 3 7 1 8 9
1 4 6
8 4 7 2
4 7 1 2
8 5 4
6 3
Hard #5
8 6 3
4 9
5 1 3 7 9
3 6 1 5 7
5
7 8
9 2 7
3 4 1
1 7 9 2 4
Hard #6
9 3 1
2 3 1 6
6 5 7 8
1 5
8 2 4
2 6
5 4 6 9 1
3 1 5
2 3 5
Hard #7
7 2 6
9 3 5
7 8 3
5 9 4
7 1 6 3
6 1 4 7 9
9 6 1
4 9 3
5 2
Hard #8
3 8 2 9
8 3
9 2 3 6
5 7 6
3 8 1 5 9
5 4
4 1 6 3
1 9
6 7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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