Printable Hard Sudoku

Set 15xp9y2. 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
4 6
5 9 7
8 6 2
3
8 7 1 4 5 2
4 3 2
3 5
7 6 2 8 4
8 7 9 3
Hard #2
8 5 1 3 4 6
9
3 6 2 7
8
5 3 4
2 8 4 9 5
7 1 6 8
1 4 3 7 2
Hard #3
4
6 9 3
8 6 7 9 5
9 2
5 3 4 9
1 4 2 7 5
7 1 8
9 3 6 2
5 1
Hard #4
2
4 7 9
1 8 4 9
9 7 4 6 5 2
8 4 3 6
3 4 5 1
2 6 3 5
8 5 2
Hard #5
5 6 4
7 5 3 9
9 4 6 1 7
9 6 5
2 8 4
6 9 1
7 6
6 2
3 5 6 4
Hard #6
9
6 2 5
1 3 6
6 7 4 5
5 1 2 8 7
7 4 3 9
4 2 7 8 6
8 7 9 2
Hard #7
4 1
5 3 8 2
7 4 3
8 6 7 4
2 1
6 7 3
5 8 4 2 3
2 6 4
2 5 7
Hard #8
8 3
6 1 5
5 1 7 8
1 2 7 8
3 2 6 9
5 9
4 6
2 1
2 7 1 6 4 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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