Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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