Printable Hard Sudoku

Set 15ribnf. 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 8
7 2 9 1
2 7 3 4 5
9
3 9 7 1
8 5
2 5 3
6 1 8 7
9 8 3
Hard #2
7 6
9 5 2 1
3 4 9 2
5 7
2 4 7 6
8 1 5 9
8 2 1
1 7 8
2 6 9
Hard #3
2 7 6
2 3 9
4 6 8 1 2
2 5 3
3 6 7 5 8
1 8
9
3 2 4 8
7 4 3
Hard #4
2 1
8 5 2 7
4 9 5 1
2 5 6 3
9 2 5
6 4
2 6 1
4 1 2 7 9
5 8
Hard #5
6 3 7
2 7 6
3 8 6 4 2
5 4 9 1
3 2 4
8 4
4 7 1 6
2 9 8
2 5
Hard #6
2 9 6 3 1
3 7 2
5 6
7 9 1
5 1
6 4 5 7 8
3 2
5 7
2 8 6 9 5
Hard #7
1 2 7
9 2 5
3 6 8
4 1 8 2
2 4
5 9 6 7
3 7
9 1 3 5
6 4 2 5
Hard #8
9 7 3 8 4
7 9 2
6
8 2 4 1 9
5
1 2 3
7 8 2 6
6 5 3 8
8 6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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