Printable Hard Sudoku

Set rdxy21. 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
7 6
9 8 7 4
6 9 2 5
9 7 2
5 6 1 4
2 3 1 8 9
8 4
5 8
3 5 2
Hard #2
6 1
8 1 5 4
7 3 9
1 3
3 2 6 9 5
4 1 8 9
9 5 3
4 2 9 1 6
4
Hard #3
7 3 2
2 4
9 5 6
1 5 3 2 8
5 6
6 8 4 9 7 3
8 6 9 1
8 6
3 7
Hard #4
7 5 6 4
1 7
4 7 3
2 7 6
5 9
8 6 5 1
9
7 3 9 6 8 2 5
1 7 6
Hard #5
2 7 3 1
1 6 4
6 2
7 5 8
8 1 6
1 9 4
9 2
4 6 2 1 8
5 2 7 9
Hard #6
5 7 8 1
9 1 2 7
7 3 6
8 4 6 1
3 9
6 4
7 5 3
4 8 1 9
5 2 4
Hard #7
5 8 9 7
2 9 7 1
7 4 6 5 8
5 7 8
7 9
8 4 2 3
7 4
7 2
4 1 9
Hard #8
2 7 3
6 1
7 3 9 5
2 7 3
5 9 6
2 7 5 9
1 3 4
3 4 5 1 2
2 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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