Printable Hard Sudoku

Set 1rf5v4h. 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 9 2
7 2 8 5
4 3
9 3 6 8
3 6 2 9 5
4 7
5 9 1
3 7 6
8 2 4
Hard #2
7 5 9
3 4
9 8 6
1 3 8 5 6 4
8 5 7 9
1 9 6 8
1 3 2
2
4 1 5
Hard #3
3 8 5 6 4
5 1 2
8 9 6 3
2 7 3 4
1 6
7 9 1
2 4 9
9 6 2
7 8
Hard #4
5 2
9 7 4
8 6 1
4 1 9 5 7 2 6 8
6 8 9
8 1 4 6
1 8 2
6 5
7
Hard #5
2 9 7 5 1
1 9 6 3
1 4 7
4 5 2
7 2 3 8
1 7 2
9 5
7 4
8 7 3
Hard #6
3 6 7
7 1 8 6 9 3
2 8
9 6 4 2 5
3 1 2 4
9 4 6
1 7
5 3 4 1
Hard #7
7 6 5 1
9 6 8
3 4 1 9
4 1 9 6
5 7
6 5 4 8
1 7 4
8 2
9 2 5
Hard #8
3 9 6
5 1 4
9 4 2 3 7
7 1 8
5
3 7 5 4 1
2 1 8 7 9 5
8
6 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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