Printable Hard Sudoku

Set 1y38mvp. 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
5 4 3
8 4 6 2
4 9 1 2 5
5 2 1 4 3
9
1
3 1 5 6
2 6 9 4 1
Hard #2
7 4 1 3
6
1 9 5
8 4 7 1 9
9 1 5
3 8
2 4 3 7 8
3 8
4 6 1 3
Hard #3
3 8 5
4 2 7
2 3 9 1
6 2
6 3 4 7
3 9 6
7 4 9
6 4 9 5
7 5 6
Hard #4
7 6 1
2 8
8 9 2
5 8
3 8 7 9 4
6 2 1 5
3 8 1 7 6 2
9 7 4
6
Hard #5
3 8 5
7 1 2 5 3
4 1
6 1 5
9 2 4 6
7 9 8
6 1 9
2 4 8 3 7
8
Hard #6
1 5 7 8
4 9
9 3 8
7 1 8 9
6 8 4 3 1
2 3 6 9
1 8 4
4 5 9 2
Hard #7
8 1 6 3 2
7 5 6
9 7 4 2
4 8 6 9
7 8
5 1
5 6 4 8
1 2
7 8 9
Hard #8
7 4 8
8 5
6 7 2
7 5 6
6 1 9
5 4 2 3 6
9 3 1 4 2
6 9
2 1 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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