Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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