Printable Hard Sudoku

Set b3tiv5. 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
9 7 2 5 4
2 8
8 9 4 1
4 1 6 9 2
5 9 8
9 8
6 5 1 2 4
1
Hard #2
4 2 1 7
4
4 9 2 8
7 1 2 5
1 4 8 6
3 6 9 2
2 5 9
5 6
6 2 3
Hard #3
1 6 5
8 9
7 1
6 1 4 9
2 3
3 4 9 5 8 7
7 3 5 4
9 2 6
3 8 1
Hard #4
3 8
5 9 1
4 8 1 3 9 2 5
7 9 3
9 6 4 8
2 6
1 2 7
9
3 7 1 6
Hard #5
7
9 4 6 3 1 2
8 2 1 6
5 7 1 3
5 8 6 7
8
4 8
7 1 3 4
8 5 9
Hard #6
6 4 9
5 1 2 4 7
1 7 9 8 5
6 3
7 1 6 5 9
7 4 5
3 4 6
1 9 7
Hard #7
7 9 6 8
1 6 7
8 1 5
2 9 5 3
1 3 9 7
4 1
5 8 3
8 6 2 5 9
2
Hard #8
2 9 5
8 6 2 3 1
6 3 4
5 4 2
7 5 8 6
2 9
6 8 1
9 7 1 5
1 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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