Printable Hard Sudoku

Set 1v5lnfc. 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
8 7 3 9 2
6 8 4 3
3 1
9 7 5
8
8 4 1 7
1 6 2
4 9 7
3 8 5 2
Hard #2
4 7 9
8 7 6 4 3 5
2 1 6
9 2
1 6
7 3
5 1 6 8
2 1
6 1 3 5 9
Hard #3
8 9 2 7
4 7 5
2 4 5 8 1
8
3 7 1 9
2 8 5 1 4
9
5 8
3 7 4 2
Hard #4
9 5 6
5 2 1 4 7
3 2
7 5 9 1
9 6
6 7
9 8 6 4
8 3 1
1 5 4 2
Hard #5
5 4 1 3 9
6 2
1 9 8
7 6 9 5
3 5 8 1 6
8 3
2
9 8 6 5
3 4 6
Hard #6
2 3
7 8
5 7 4 1
9 1
8 6 4 5
3 5 6
6 5 8
1 7 4 2
3 6 2 1 7
Hard #7
2 3 9
4 9 3
9 6 8 1 4
3 5
1 7 2
6 9 7 4 1
8 3 1 4
6 2
1 3
Hard #8
1 6 3
5 4 9
2 3 4 8
6 5 9 8
9 2
1 2 6 5
5 7 3 6
4 1 5
3 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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