Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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