Printable Hard Sudoku

Set f5hctb. 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
4
8 3 7 6
6 5 3
7 6 4 1 2
8 3 9
1 2 6 5
4 5
3 7 8 9 2
9 1
Hard #2
2 5 3 4 9 7
2 1 5
9 6
5 3 1
9 7 5
3 2 9 7
1 2
7 4 8 2 3
8
Hard #3
2 1
6 5 9
7 9 3 2
7 5 1
4 8 9 3
2 4 9
1 6 5 8
8 2 5 4
4 7
Hard #4
1 7 8
7 3 6 1 9
5 7 4 2 6
9 2 6 1 3
4 9 8
6 5
5 3 8 6
9 2
Hard #5
8 4 2 7
6 5 1 4
4 5 6
9 7
7 1 6 9
5 3
3 6 5 9 8
8 3
4 5 2
Hard #6
3 2 9
6 1 2 9 8
1 2
2 9 7
7 6 5 4
2 5 8
1 9 3 6
1 4
2 8 6
Hard #7
3 2 4
5 6 7 3
7 1 9
1 8 5 9
4 2 3 8
2 7 5
7 1 3
6 8 3
4 1
Hard #8
5 3 2 6
9 1 2 7
9 4
4 5 8
7 2 3
5 1 8 7
9 8
7 2 5
6 7 3 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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