Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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