Printable Hard Sudoku

Set ua3ppo. 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
2
2 3 4 7
4 7 2 6
6 9 5 4
7 5 1
4 6 7 2
8 2 3
5 4 8
4 3 7
Hard #2
6 1 8
8 7
6 2
7 5 1 9 8
5 3 6
9 4
7 6 2
2 9 1 5
1 5 3 6 9
Hard #3
7 3 6 1
4 1 8 5
6
8 9 2 7 3 5 1
4 1 9
7 9 2
9 3
7 9
3 8 2
Hard #4
2 5 3 7 6
6 7 4 2
7 4 8
1 9 3 8
6 2
5 4 1 9
9 1
8 7 3
7 5
Hard #5
7
1 8 6 3
5 2 9 1
5 1 6 2
7 4 8 1
4 7
2 4 9 3
8 9 1
9 1 5
Hard #6
7 9 8 5
5 7 9
1 6 2
6 1 8 3 5
2 1 8
4 9 6
5 4 1
2 5 3
6 9
Hard #7
3 7 4 1
4
4 8 3 6
6 9 1 7
9 3
3 7 5 2
7 9 1 3
8 7 6
2 3 1
Hard #8
5 8 9 6 4
1 5 9 7
3
9 7 3 8 2
5 1 9
6 2 8
3 7 6
3 2 4 5
1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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