Printable Hard Sudoku

Set 19amy6y. 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 1 5
7 9
9 6 2
9 5 2 1 7
3 9 7 2
8 6 9
9 2 6
7 6 9 8
3 7
Hard #2
5 8 2
7 5 3
4 6 9 1
4 1 8 6
8 5
9 3
2 3 6
3 1 7 9
5 1 4 2
Hard #3
3
3 5 1 4
8 7 6
3 7 6 9
5 2 9
9 6 7 2
8 1 3
7 6 2
4 3 6 9
Hard #4
8 7 3 9
9 6 8
3 5 6
8 2 3 7 4
8
1 4
4 2 7 9
3
3 5 1 8 4 7
Hard #5
2
1 9
5 7 3 4
1 3 5 6 4
7 6 1 4
9 3 5
7 9 4 1
2 7 6
6 1 8
Hard #6
4 8 2 5
2 9 1 3
8 6 9 2
7
3 6 8 2
1 2 9 3
4 1
7 5 1
1 6 4
Hard #7
6 7 8 5
5 2 8
5 3 4 2
2 7 9 4
9 8 4 3
1
9 3 2 1
1 5
5 6 3
Hard #8
1 2 7 6
6 5 1 8
9 6 3
8
5 1 4
3 1 9
1 6 7 2 5
3 7
7 4 3 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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