Printable Hard Sudoku

Set e3pw2i. 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
1 6 5 4
2 4 9
3 8 1
9 5 3 7
3 6
6 4 8 7 2
5
1 7 9 8
2 3 5
Hard #2
2 6 7 9
9 4 8 2
6 1 3
1 3
3 4
2 7
4 1
7 3 8 1 6
6 5 4 9 8
Hard #3
7 1 8
3 1 4
2 4 1
8 9 6 5
3 7 9
1 3 2
8 3 5
9 5 4 8
7 8 2
Hard #4
5 3 9 1
8 6 5
9 2 8
2 6
7 3 5
6 5 3
7 3 1 4 9
4 7 1
2 6 7
Hard #5
5 4
6 9 8
8 2 4 1
4 1 9 6 3
3 2
6 3 5 1
5 7 2
8 7 1 4
8 2
Hard #6
9 8 7 4
1 8 9
6 9
6 5
2 4 5 9
9 2 1 8
9 7
1 4 5
2 7 8 5 1
Hard #7
8 2 5 9 6
1 7
9 5 8
2 1 4 3
3 4 5 1
6 9 7 4
5 8
6 9 7
7 6
Hard #8
1 7 9
6 3 1
9 5 7
4 1 5
2 7 5
8 6 2 3
1 4 9 7 2
8 6 4
5 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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