Printable Hard Sudoku

Set 1se5n9d. 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 4 6
1 9 2 4
8 4 5 3 6
7 3 9
1 3
3 5
5 8 3 2 1
5 4
6 7 2
Hard #2
8 3 1 9
5 6 3 1 4
7 2 8 5
5 1
6 4
7 3
5 1 4 9
7 5
4 3 2 8
Hard #3
5 8 1
1 9
8 6 2 3
8 7 1 5 2 9
9 3 6
9 6 2 8
6 7
1 4
3 4 5
Hard #4
3 8 2 7 9
5 1 2
4 9 1
4 7 6
9 7 8
9 5 2 4
3 6 2 1
9 4 3
8
Hard #5
2 7
7 4 8 2
6 9 8 7 3
9 3 4 5
7 3 8 1 4
8 2
9 6 5 7
8
1 4
Hard #6
3 1 7
8 4 1 2
5 4 9
8 5 4
6 2 3
4 1 3 5
5 7 3 2
4 9
6 9 3
Hard #7
1 6 7
8 5 9 4
3 7 6
3 9 6
2 5
5 4 3 1 2 8
5 1 9 7
8 4
1 3
Hard #8
1 4
5 6
8 2 9
2 4 3 9 8
3 6
6 8 1 3
7 6 2 5
6 7 8
1 5 3 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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