Printable Hard Sudoku

Set 1btnqv2. 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 8 7
7 9 6 3 4
6 3
7 9
6 4 3 1 2
9 7 8
2 7
4 5 2 3 1 9 7
Hard #2
9 5
2 7 4
7 6 1 9
2 8
5 8 9 3 1
4 8
5 1 8 7
4 6 2 1
3 4 9
Hard #3
1 6 2 5
4
9 3 1
3 9 8 2 6
9 6 7
1 9 5 7 8
7 2
4 5
3 8 9 2
Hard #4
4 2 8 1
5 9
2 7 8 6 5 4
5
3 2 6
1 9 2
9 6
4 8 9 6
1 9 3 7
Hard #5
7 8 9 5
5 3 6 4 8
1 3 9
5 4 6 8
8 4 7 2
7 2 5
7 5
9 2 8 3
Hard #6
2 1
4 6 7 8
1 4 9 6
7 3 5
8 6
1 7 4 6 2
3 9 6
4 5 9 2
4 5
Hard #7
4 2 8 7
8 9 6
3 7 8
9 7
2 4 9
6 5
4 9 1 7 8
5 8 2 9
3 2 9
Hard #8
7 6 5 9
8 1
2 5
4 6 8
5 7 3
2 9 6 4
7 3 8
1 6 9 2 7 3
9 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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