Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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