Printable Hard Sudoku

Set cftf4r. 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
6 2 9 8
8 3 4
5 2 1
7 5 1 8 6
8 2 7
3 7
7
6 4 9 8
9 5 2 4
Hard #2
2 9 1
9 1 2 4 5
7 6 1 2 4
3 8 4
7 1 6
7 5
8 4 2
6
4 5 3 9
Hard #3
2 7 5
3 8
1 8 5 4
5 3 8 4
6 9 2
4 8 5 7
6 4 1 7
2 1 4
3 8
Hard #4
3 7 9
8 7 2 6
6 1 7
7 2
9 5 2 8
3 6 5
1 9 5
7 9 4 1
5 3 1
Hard #5
5 4
9 4 8 1
6 8
3 1 5 2
2 6 7 8
4 3 8
6 4 1
1 8 2 7 9
2 4
Hard #6
4 8 9 7 2
5 9
3 2 7
1 3
6 8 4 3
1 6 5 8
9 4 8 6 5
1 3
1 9
Hard #7
6 4 7 5
3 1 6 2 4
7 9 6
8 7 4
4 9 6
6 8 3
6 8 2
3 5 4 6
5
Hard #8
8 6
3 8 5 1
6 7 9 4 5
1 3 8 4 6
8 5
5 1 7
2 1 7
3
4 3 7 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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