Printable Hard Sudoku

Set w857ze. 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
3 7 8
5
1 3 4
5 7 1 8 3
5 4 2 9 6
6 9 3
3 2 9
2 4 5
4 8 7
Hard #2
2 6 1
6 4 8 7 5
8 7 4
8 2 1 6
4 5 9
2 1
9 8 1
9 3
5 1 8 3
Hard #3
7 8 1 6
5 2 9 7
6
6 9 3
5 3 6 1
3 4 9
1 9 8 4
2
7 6 9 3 5
Hard #4
2 9
4 8 6
2 8 3
8 5
5 3 2
9 7 4
3 5 7 8
1 2 3
8 7 4 2 9 5
Hard #5
3 8 2
1
6 4 9
2 9 7
5 4 8 2
4 2 6
7 2 4
2 4 6 1 9
3 5 7 2
Hard #6
7 1
5 6 2
2 6 1
4 9
7 5 9 8
8 4 6
1 3 5
5 7 4 8
8 3 9 7 4
Hard #7
4 7 9 1
5 8 6
3 2 5
6 4 3
7 8 6
8 1
7 8 6 4
2 3 9
4 1 2 3
Hard #8
3 2 5 9
5 9 8
1 3 6
9 8 6 5
6 3 4
8 1 7
3 2 9 7
5 4 1
5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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