Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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