Printable Hard Sudoku

Set 1rp85dc. 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 5 3
2 9 4
7 6 5
8 1 7
3 7 2 6 5
8 3 1 2
3
4 9 6 7
5 3 7
Hard #2
6 7 3 9
8 2 1 5 4
2 3
4 9 8 3
5 9 6
7 9
7 8 4 5
2 7
9 2 8
Hard #3
7 4 9 8 3
2
3 1 7 9 5
9 3
5 9 1 7
7 8
7 6 4 3 2
9 3 6 2
4
Hard #4
9 4 8 1 3 6
4
9 6 1
5 7 2
6 5 7
1 5 9 4
7 8
3 8
1 3 9 8 6
Hard #5
1 4 8 6
6 2 9
2 5 8 3
4 2
6 1 3 2
6 7 1
4 9 7 5 8
7 4 9
6
Hard #6
8 6 2
6 4 9 1
3 2 5 9
4 2 6
6 4 8
9 1 8 3 7
5 4
2 1 7
8 2
Hard #7
7 4 3
5 3 4 6 8
7 4 9
7
6 4 2 8 7
1 8 6 9 5
4 9
1 2
9 6 5
Hard #8
4
8 6 4 7 3
3 5 6 7
5 9 6 4
3 1 6
7 4 8 1
6 1 9
9 4 5 8
3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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