Printable Hard Sudoku

Set 8o0ocj. 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 4
7 1 6 3
2 5 7
6 3
4 5 2 7 3
5
9 3 2 6 8
1 4 9 2
5 8 7
Hard #2
5 6
7 4 1 3
6 9 2
4 8 2 5
5 8 7 9
3 1 6 8
3 5 7 4
7 2 8 4
Hard #3
6 4 1 7 2
7 1 6 4
5 4 6
5 2 3 7
6 1
2 4
7 9 2
3 2 9
4 5 8
Hard #4
9 5 7
9 1 2 8
4 6 1
3
5 2 6 7
9 8
9 8 4
2 5 1 4 9 8
6 3 2
Hard #5
2 6 9
2 4 8
9 1 2
3 8 7
3 2
8 4 1 9 3
2 1 4
8 9 5 3
5 9 7
Hard #6
5 4 3
4 3 9 5
8 4 5
5 1
1 7 4
7 9 5
9 8 5
7 2 6 8
6 8 4 2
Hard #7
2 1 3 5
6 4 2 9
4 8 7 6 9
4 5 8
5 8 3 2 4
9 2 8
4 7
1 3 9
Hard #8
6 4
7 8 2
2 5 7
6 8 4
4 6 1 9
9 2 7
5 1 6 3 4 9
4 8 2 3
7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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